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1·A land drain is usually a pipe buried in farm land but it may also be an open channel.

农田的排水系统通常是埋在农田中的管子，但也可以是明渠。

2·The authorities have mobilized vast numbers of people to drain flooded land and build or repair dikes.

当局动员了大批民众为遭受洪灾的地区排涝并修建或修复堤坝。《柯林斯英汉双解大词典》

3·This is fen country – the mills drive pumps that drain the land.

这是一个沼泽国 - 这些工厂启动水泵排干地面积水。《柯林斯英汉双解大词典》

4·To do that, you have to drain the water from the land, move the water elsewhere, and divert the water sources such as rivers.

要做到这一点，我们得把水从土地中排出来，把它移到别的地方，并引导其他水源转向，比如河流。

5·They intend to drain the land to make their crops grow better.

为使庄稼长得更好，他们打算把那块地的水排干。

6·They have organized vast Numbers of people to drain flooded land.

他们组织了很多人将受涝地区的水排干。

7·They drain the swamp and turn it into fertile land.

他们排干沼泽地的水，将它变成了肥沃的土地。

8·The pollution situation of the feces and sludge is large amount of drain and occupied land, causing diseases and disgust in our country.

我国粪泥污泥的污染现状是排量大、占地多、致病性高。