电梯开动了,接着剧烈震颤起来,然后就毫无反应了。The lift started off, juddered, and went out of action.电梯嘎吱一声停在了一层。The elevator creaked to a halt at the ground floor.电梯修理工可以转动这根杠杆直接操作机器。An elevator mechanic can work the machinery directly by tu...
Minute fragments of shoot apices are proverbially difficult to culture.微小的茎尖切段通常是难以培养的.This concept has now been replaced, for stem apices, by the tunica - corpus theory.此观点目前已经被原套原体学说所取代....