在用水以前先将其中不清洁的东西过滤掉.Filter out all the dirt before using the water.清洁的衣服和良好的举止能给人以好感.Clean clothes and good manners are prepossessing.和孩子讨论污染问题，强调清洁的街道、草地或公园有多么美丽。Discuss pollution with your child, emphasizing how nice a ...
所有的门都用砖堵了起来，防止破坏分子闯入。All the doors have been bricked up to deter vandals.我们的车被堵在里面，要等很久才能走。Our cars get blocked in and we can't leave for ages.这个小女孩眼睛一直紧盯着他身后的那堵墙。The child kept her eyes fixed on the wall behind him...
Derrick and I have been laying out the system of irrigating ditches.德里克跟我在一起修建那个灌溉网.He had been in command at the irrigating ditch the day before.上一天,在灌溉渠边,是他担任指挥的.The water in the irrigating ditch was well up.灌溉渠里涨满了水....