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to phrases
toughen ['tʌf(ə)n] v
gen. 使强韧; 使变强硬; 使韧化; 使变黏稠; 使变困难
archit. 使变坚韧; 使变粘稠
plast. 增韧; 增黏稠
tech. 韧化 (作用)
toughen
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China1

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