形容词
中文翻译：坚硬的
同义词：
['stout', 'robust', 'tough', 'hardy']
例句：
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1. The old tree is so tough that it can withstand a lot of wind and rain.
这棵老树如此坚韧，可以经受住很多风和雨。
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2. He's tough as nails;he won't back down from a challenge.
他非常坚强，不会在挑战面前退缩。
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3. The tough conditions made the journey even more challenging.
艰苦的条件使得旅程更加艰难。