起初，达特非常紧张，最后终于放松了下来。Dart, who had at first been very tense, at last relaxed.起初，他幸好不知道那些针对他的阴谋。At first, he was blissfully unaware of the conspiracy against him.起初好玩的事很快就变成了艰苦的工作。What started out as fun quickly became har...
Furiously he tested the spark - plugs, stared at the commutator.他气呼呼地测试着火花塞, 眼睛盯着转换器.The two ends of the wire are connected to a split - ring commutator.导线的两端联接到裂环整流器.Commutator and brushes shall be free of grease, or ot...