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。
Translation is a labour-intensive task.
翻译是一项费时费力的工作。
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。
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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