bolt: n.1.螺钉，螺栓。2.(门窗等的)插销；闩，锁簧。3.箭，矢；弩箭；【军事】枪机，枪栓。4.电光，闪电。5.(水等的)喷射。6.(马等的)脱缰；跑掉，逃走，逃亡；缺课；〔美国〕脱党，变节。7.(棉布等的)一匹；(纸等的)一卷。8.短(木)材。短语和例子a bolt and nut 螺栓与螺母。 He has shot his last bolt. 他已作出最后努力[弹尽矢
through: 短语和例子The river flows through the city. 这条河贯穿这个城。 May I through you ask the delegate of ... to ... 可否通过你代为请求某代表…。 The sun breaks through the clouds. 日光从云缝中穿漏出来。 through the winter 整个冬天，一冬。
