形容词
中文翻译：坚固的
同义词：
['hard', 'solid', 'robust']
例句：
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1. The armor was made of shield-like plates that were incredibly hard to penetrate.
这件盔甲是由像盾牌一样的板片制成的，极其难以穿透。
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2. The tree's trunk is as hard as a shield, and the branches are thick and strong.
这棵树的树干坚硬如盾，树枝粗壮而有力。
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3. The new car has a hard exterior shell that protects the interior from damage.
这款新车拥有坚硬的外壳，保护内部免受损害。