difficult-cleaning tubing 难清洗油管
difficult cleaning
困难的清洗
以上为机器翻译结果，长、整句建议使用 人工翻译 。
If cleaning sand off a potato was difficult, picking grains out of sand had to be much worse.
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Something has to be done with the terrible traffic jams, cleaning up the city, and a lot of other things that are much more difficult to change for a whole number of reasons.
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