boundary

noun

1. 边界；界限；分界线
   a real or imagined line that marks the limits or edges of sth and separates it from other things or places; a dividing line
   1. national boundaries
      国界
   2. county boundaries
      郡界
   3. boundary changes/disputes
      边界变化 / 争端
   4. The fence marks the boundary between my property and hers.
      那道篱笆是我和她的住宅之间的分界。
   5. Scientists continue to push back the boundaries of human knowledge.
      科学家不断扩大人类知识的范围。
   6. the boundary between acceptable and unacceptable behaviour
      认可的和不被认可的行为之间的界限
2. 使球越过边界线的击球（得加分）
   a hit of the ball that crosses the boundary of the playing area and scores extra points

1. N-COUNT （土地的）分界线，边界
   The boundary of an area of land is an imaginary line that separates it from other areas.
   1. ...the Bow Brook which forms the western boundary of the wood...
      构成了这片树林西部边界的鲍溪
   2. Drug traffickers operate across national boundaries.
      贩毒分子进行跨国贩毒活动。
2. N-COUNT （学科或活动的）界限，边界
   The boundaries of something such as a subject or activity are the limits that people think that it has.
   1. The boundaries between history and storytelling are always being blurred and muddled.
      历史和轶闻的分界向来是模糊而混乱的。
   2. ...extending the boundaries of press freedom.
      扩大新闻自由的界限

1. Drug traffickers operate across national boundaries.
   贩毒分子进行跨国贩毒活动。
2. The boundaries between history and storytelling are always being blurred and muddled.
   历史和轶闻的分界向来是模糊而混乱的。
3. Just before the town boundary fork left onto a minor road.
   快到城镇边界时要走岔路的左边一条小路。
4. A river forms the boundary between the two countries.
   一条河流成了两国的分界线。
5. Compared with the long-standing friendship between the two countries, their boundary dispute is only an issue of a temporary and limited nature.
   两国之间的边界争论，比起两国的悠久友谊来说，是一个暂时性和局部性的问题。
6. The boundary between Shanxi and Shaanxi is the Huanghe River.
   山西和陕西以黄河为界。
7. Airplanes drag along a very thin shield of motionless air known as a boundary layer.
   飞机曳着一层很薄的紧贴机面不动的空气一道向前运动，这层空气叫做附面层。
8. The two neighbouring countries have at last reached an accommodation on their boundary problem.
   那两个毗邻国家终于就边界问题达成了和解。
9. Three values of nonparallel boundary stress components can be derived from considerations of equilibrium of the plate.
   非平行的边界的应力分量的三个值可以从板的平衡考虑来导得。
10. In order to minimize the boundary layer effects, the nozzles were made as short as possible.
    为了减少附面层效应，喷嘴做得尽可能地短些。
11. The representatives of the two countries negotiated the boundary question for several weeks.
    两国代表就边界问题谈判了几个星期。
12. From here the boundary turns southwestward.
    边界由此折向西南。
13. Our first example of confining waves will be to confine a wave at one boundary.
    约束波的第一例子是使波动在一个界面上受到限制。
14. Is there anything that is beyond the boundary of human knowledge?
    有什么东西是超出人类知识范围的？
15. The two counties have the canal as their common boundary.
    两县以运河分界。
16. As in the particle in a box, it is the boundary conditions that force us to quantize the energy.
    像在箱中粒子那样，边界条件迫使我们使能量量子化。
17. This method ′ s main function is to correct the bottom friction coefficients and open boundary conditions.
    所用的同化方法为伴随同化方法，该方法的主要作用是校正开边界条件和底摩擦系数。
18. The series solution for boundary value problem of nonhomogeneous harmonic equation with variable coefficient is obtained.
    使变系数非齐次调和方程边值问题的求解有了新的进展。
19. The initial boundary value problem of fourth order wave equation with dispersive and dissipative terms is studied.
    研究具色散和耗散项的四阶波动方程的初边值问题。
20. The grain boundary energy was measured with thermal etching method.
    用热蚀刻方法测量了合金的晶界能。
21. The boundary conditions about the temperature and pressure were loaded by means of the segmental application method.
    采用分段加载方法对模型施加温度和压力边界条件。
22. This paper concerns with the applications of the boundary element method to electric field problem associated with corrosion.
    研究腐蚀电场平面问题的边界元理论和分析方法。
23. As an application, we present the coupling of FEM and natural boundary element.
    作为应用，我们也研究了无限扇形区域的有限元与自然边界元耦合法。
24. The direct boundary element method used in sound field analysis is studied.
    研究了用于声场分析的直接边界元法。
25. Alternatively, one may utilize the wave equation and appropriate boundary conditions to yield a specific solution.
    另外，我们也可以利用波动方程和适当的边界条件以得出一个特解。
26. I forgot the name of this one, it was near the boundary of Germany and Austria.
    德国和奥地利交界的湖。忘记名字了。其实所有的湖中我就记得2，3个名字还对不上号。
27. In this paper boundary integral method is generalized to solve the problem of bending of heavy camber cantalever beam.
    采用边界积分法求解了大挠度悬臂梁的弯曲问题，给出了求解大挠度悬臂梁的解析解的新方法。
28. The high-order boundary conditions for the problems of Laplace equation in infinite region hare been developed.
    对无限域Laplace方程问题，推导出了高阶边界条件。
29. We investigate the characteristic boundary value problems for first and second order complex hyperbolic equations.
    讨论了一阶和二阶双曲复方程的特征边值问题。
30. In this paper, the second initial and boundary value problem of a nonlinear singular diffusion equation is discussed.
    讨论了非线性奇异扩散方程的第二初边值问题，证明了存在唯一的光滑解，且解关于初值是连续依赖的。

  border borderline boundary frontier【导航词义：边界】

  border n. 边界，边境

〔辨析〕多指靠近两国或两地区分界线的区域。

  borderline n. 边境线，分界线

〔辨析〕指划定国与国之间边界的标志线。

  boundary n. 分界线，边界

〔辨析〕侧重指某区域最外的界线，常和领土有关，也指地图上正式标定的、双方认可的边界或较小行政单位间的界线。

  frontier n. 〈尤英〉边界，边境

〔辨析〕指两国接壤的前沿地区，多有军队驻防。

noun

1. the greatest possible degree of something
   1. what he did was beyond the bounds of acceptable behavior
   2. to the limit of his ability

   Synonym:    limitbound

2. the line or plane indicating the limit or extent of something

   Synonym:    boundbounds

3. a line determining the limits of an area

   Synonym:    edgebound