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。

youdao

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。

youdao

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。

youdao