(使)变坚韧,(使)变顽固
Toughen \Tough"en\, v. i. & t. [imp. & p. p. {Toughened}; p. pr. & vb. n. {Toughening}.] To grow or make tough, or tougher.
toughen v : make tough or tougher; "This experience will toughen her"
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