Alongside each irrigation canal a drainage ditch was dug.

沿着每一条灌溉渠,他们还挖了一条排水沟.

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We must dig a drainage ditch to run off the water.

我们得挖一条排水渠把水排掉.

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Never pipe the discharge line directly into a drainage ditch, sewer or sump.

不要把排泄管直接插入排泄地漏 、 污水管或污水坑里.

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The relief valve should never be solidly piped into a drainage ditch, sewer or sump.

安全阀绝不能用坚硬的管道连接到排水沟 、 排水管或污水坑里.

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When the dead leaves were cleared away from the drainage ditch dirty water surged out.

当枯树叶子从排水沟中被清除后,脏水很快大量流出去了.

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