Sam was flicking a flashlight on and off.萨姆啪啪不停地把手电筒开了又关。It rained on and off all day.哩哩啦啦下了一天雨.This low-impact exercise involves stepping on and off a platform following routines to music.这一低强度锻炼的内容包括在伴随音乐做完固定动作之后重复踏上踏下...
The larvae may be excreted in the faeces.幼虫会连同粪便排出.The faeces contain nitrogen and it is that which fertilises the desert soil.粪便含氮，而正是氮可以肥化荒芜的土地。They stand on their own accumulated faeces, which quickly become disease -...
学位课程不讲授这个课题。The topic is not taught in degree courses.关于这个课题缺乏可靠资料。There was a dearth of reliable information on the subject.我要就我的研究课题同导师见一次面。I have a meeting with my supervisor about my research topic....
相比较而言,端环氧基聚氨酯醚海岛结构增韧剂的综合性能较好.Among them , sea - island structure flexibilizer had good synthetical properties.与其他增韧剂相比, BDS对PP的增韧性能较好.Compared with other toughening agents, BDS is a better one for PP.主要介绍了奇士增韧剂对YJ型环氧树脂浸渍...
Blackbirds were sitting at the tops of trees singing.乌鸦停在树梢鸣叫着.Blackbirds and thrushes are songbirds.黑鹂和鸫.The blackbirds were whistling in the garden.山鸟在花园里婉转地鸣叫着....
这是通过中枢神经系统的调节作用实现的。This works through the mediation of the central nervous system.他正在服用一种危险的药物：这种药物能很快影响到中枢神经系统。He's taking a dangerous drug: it acts very fast on the central nervous system.语言中枢位于左半脑。The major centr...