形容词
中文翻译：坚硬的
同义词：
['solid', 'robust', 'sturdy例句：1. The steel beam is strong enough to support the weight of the building.（这根钢梁足够坚固，能支撑建筑的重量。）']
例句：
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1. The steel beam is strong enough to support the weight of the building.
这根钢梁足够坚固，能支撑建筑的重量。
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2. The old house is made of sturdy wood.
这所旧房子是用坚固的木头建造的。
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3. Steel is a very useful material for making tools and machines.
钢铁是一种非常有用的材料，用于制造工具和机器。