He sagged wearily back in his chair.他疲倦地瘫坐到椅子上。Morrison took the news badly and from then on his spirits noticeably sagged.这消息对莫里森打击很大，从那以后，他明显萎靡不振。His upper lip was flat, but the lower one sagged.他上唇扁平，下唇耷拉。There were p...
Many pesticides are irritants.很多杀虫剂都具有刺激性。Drink a lot lots of water, a boy tebacle. Avoid tobacco smoke and other irritancy irritants.多喝水, 少吸烟,少喝酒,和其他刺激性的东西.Mustard oils are irritants, capable of causing serious injury t...
He died in unexplained circumstances.他死因不明。Soon after leaving Margate, for some unexplained reason, the train was brought to a standstill.离开马盖特不久，不知什么原因，火车突然停了下来。Soon after leaving Margate, for some unexplained reason, t...
物理学研究力学、热学 、 光学 、 声学和电学.Physics studies mechanics , heat, light, sound and electricity.这两个学生都做了不少电学实验.Both students have made quite a few experiments on electricity.从量子电动力学可以得出所有已知的电学 、 力学和化学定律.Out of quantum electrodyna...
一道拦河坝将会在上游拦住水流，抬升水位。A barrage would halt the flow upstream and lift the water level.拦河坝把河流控制住了.Rivers are controlled by dams.我们决定筑一道拦河坝.We decided to dam the river....