Cleaning of gas is difficult and Labour intensive process.

天然气清洁是困难的，劳动密集的过程。

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However, the process took a long time and was labour-intensive.

但是，这个过程花费了很长时间，并且这个过程还消耗了大量劳力。

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Translation is a labour-intensive task.

翻译是一项费时费力的工作。

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Translation is a labour-intensive task.

翻译是一项费时费力的工作。

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