动词中文翻译
中文翻译：变硬
同义词：
['harden', 'harden up例句：1. The metal has hardened after being exposed to the sun for a long time.（金属在长时间暴露在阳光下后变硬了。）2. The ground hardened as the snow melted away.（随着雪的融化，地面变硬了。）']
例句：
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1. The metal has hardened after being exposed to the sun for a long time.
金属在长时间暴露在阳光下后变硬了。
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2. The ground hardened as the snow melted away.
随着雪的融化，地面变硬了。
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3. Hardening is a process that occurs when materials are subjected to heat or pressure.
硬化是一种过程，当材料受到热或压力时会发生。