你一定注意到他有时候显得特别疲惫。You must have noticed how tired he sometimes looks.他正挥手以引起他们的注意。He was waving his arms to draw their attention.罗斯听到了熟悉的声音，但没注意听说的是什么。Rose heard the familiar voice, but tuned out the words....
Reduction - metathesis method for preparation of strontium carbonate from celestite is developed.提出还原 - 复分解法制备碳酸锶的新工艺.Several kinds of ruthenium - catalyzed organic reactions were reviewed: hydrogenation, oxidation, isom...
The two ends of the pipeline are connected with the radiator.管道的两端与暖气片相连接.The pipeline supplies Jordan with 15 per cent of its crude oil.该管道供给约旦15%的原油.A single pipeline serves all the houses with water.一条单管路给所有的房子供水....