名词
中文翻译：Unknown
同义词：
['stiff', 'solid', 'robust', 'sturdy']
例句：
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1. The firman of the door held it firmly shut.
门的坚固部分牢牢地关上了。
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2. The firman of the bridge was so strong that it could withstand heavy traffic.
这座桥的坚固程度足以承受重车流量。
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3.The firman of the roof prevented water from leaking into the house.
屋顶的坚固程度防止了水渗入房屋。