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harden

/ˈhɑrdən/

v. 變硬；使堅定；使硬化
- Before the bowls can be painted, the clay needs two days to harden. 陶土需要兩天才會變硬，之後碗才能上色。

其他意思

v. 使變硬, 使堅強
變硬

When something hardens or when you harden it, it becomes stiff or firm.
- Mould the mixture into shape while hot, before it hardens

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