stem

• Our hopes stem from our previous achievements .
  我们的希望源于我们从前的成就。
• They stemmed from a clash of national interests .
  它们产生于国家利益上的冲突。
• The connecting rod may drive a valve stem directly .
  连杆可以直接带动阀门的把柄。
• Two t-sections are battened between the stems .
  在两个T形断面梗部之间用钢钣条连接。
• Do n't eat the stem of a mushroom .
  不要吃蘑菇的梗。
• Knowledge stems from practice .
  知识来源于实践。
• The main stem of a tree is a tapering geometric solid .
  树木的主干是一种有消度的几何体。
• The concern about this axiom stemmed from the fact .
  对于这个公理的考虑是基于这样的事实。
• The stem has a slightly smaller diameter than the valve bore .
  阀杆的直径略小于阀体孔的直径。
• The doctors worked around the clock to stem the epidemic .
  医生们不眠不休地为遏止传染病而工作。