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

Even though the climate is suitable, tea-growing is simply too costly, since the process is labour-intensive and resists automation.

尽管气候适宜，但是种茶仍然十分昂贵。因为整个种茶过程都是劳动力密集的而不适合机器控制。

youdao

It is a labour intensive process requiring significant laboratory resource over a number of years, limiting drug companies' willingness to invest.

BBC: Bill gates

With most of the work done by hand without any help from modern technology, its production is a lengthy and labour-intensive process.

BBC: The gateway to Kilimanjaro

Much of the work cutting and printing laminates that make the shell of the ball was done in factories, but stitching, the most labour-intensive process, was usually outsourced to families in villages around Sialkot.

ECONOMIST: Ending child labour can have unexpected consequences