名词
中文翻译：硬化剂
同义词：
['hardening agent', 'hardening agent例句：1. The concrete was hardened by the hot sun.（混凝土被烈日晒硬了。）2. The steel plate is hardened to increase its strength.（钢板经过热处理以增加其强度。）']
例句：
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1. The concrete was hardened by the hot sun.
混凝土被烈日晒硬了。
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2. The steel plate is hardened to increase its strength.
钢板经过热处理以增加其强度。
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3. The paint was hardened with a special chemical.
油漆是用一种特殊的化学药品硬化的。