sand rat

1. When the slenderness ratio is less than 1/ 2 or the hot compression stress is not bigger than the wet compression strength of the molding sand, the rat tail should never come into being.
   当千砂层长细比小于1／2或热压应力不大于水分饱和凝聚区的湿压强度时，绝不可能产生鼠尾。
2. After pointing out the problems resulted from the mixed tubing& casing fracturing, this paper presents three kinds of improvement methods: sand settling in rat hole, nozzle adjustment, and time closing of valve.
   指出了油套混压存在的问题，提出了三种工艺改进办法：口袋沉砂法、嘴子调节法和定时关阀法。

noun

1. southern European gerbil

   Synonym:    Meriones longifrons

2. small nearly naked African mole rat of desert areas