bottom dead center
英 [ˈbɒtəm ded ˈsentə(r)]
美 [ˈbɑːtəm ded ˈsentər]
（发动机的）下死点；下（低）死点
双语例句
- The Bore is the diameter of the cylinder. The stroke is the distance the piston travels from BDC ( Bottom dead center) to TDC ( top dead center). The Bore is always mentioned first.
这个活塞上下活动，没有响声。内径指的是气缸的直径；行程是活塞从下止点运行到上止点的距离。表述时，内径总是写在前面。 - Influences of air pressure and rotating speed on bottom dead center of high-speed press
气压及转速对高速压力机下死点的影响 - This kind of camshaft makes EGR exhaust cam open the exhaust valve slightly when piston close to the bottom dead center in suction stroke, and then the large vacuum degree will suck the exhaust gas in exhaust pipe into the cylinder, in order to achieve internal EGR.
这种凸轮轴使得当发动机活塞接近吸气行程下止点时，EGR凸轮使排气门略微开启，利用缸内较大的真空度将排气管中的废气吸入气缸，从而实现内部EGR。 - The acoustic emission signal will be the weakest in the top and bottom dead center in reciprocating movement cycle, while the signal is the strongest around the central area. A trend of decline of acoustic emission signals is showed in the central area.
在往复运动周期内，上、下止点处，声发射信号最弱；行程中部附近区域，声发射信号最强；行程中部时，声发射信号呈下降趋势。 - Characterized by the advantages of both forging hammer and crank-eccentric press, the screw press, whose blow force is confined to the frame and has no fixed bottom dead center, find an important application in the field of precision forging and closed die forging.
螺旋压力机打击力封闭于机身，又没有固定的下死点。兼有锻锤和机械压力机的优点，在精锻和模锻领域得到重要应用。