单词：irrigation ditch
irrigation ditch的用法和样例：
例句
- It took half a year to dig this irrigation channel.开凿这条灌渠花了半年的时间。
- Suddenly he saw water pouring out of a hole in the wall of an irrigation ditch.他突然看到水从灌渠边上的一个洞里大量流出来。
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