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| 陡峭的; 艰巨〔难，苦〕的; 辛勤的; 刻苦的 | |||
| 艰巨的; 恶劣的 | |||
| 攀登艰险的 | |||
| 比赛艰苦的 | |||
| 险峻的 | |||
| arduous: 8 phrases in 4 subjects |
| Automobiles | 2 |
| China | 3 |
| Finances | 1 |
| Technology | 2 |
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