- back-busting
- hardly
- painstaking
- salt
- toilful
- toilsome
- tough
- trying
- 辛苦: hard; toilsome; laborious
- 的: 4次方是 The fourth power of 2 i ...
- 辛苦的工作: sworn; swot; warm work
- 不辞辛苦的做某事: take trouble to do sth
- 犁地是很辛苦的活。: ploughing is hard work
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