toughened
v.
（使某物[人]）坚韧，坚强，强硬( toughen的过去式和过去分词 );
例句:
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British regulations are also being toughened.
英国的规章也正在变得更加严格。
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You can crack this toughened glass, but you can't break it.
这种韧化玻璃只裂不碎.
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Only by taking part in practice can the young people be toughened and hardened into steel.
年轻人只有通过实际锻炼才能百炼成钢.
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Old sandals, the leather stained and toughened by sea water.
来自P. D. James
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Because by this stage of the Paralympics, we had all toughened up.
来自THETIMES
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It has no moving parts and is made of stainless steel and toughened glass.
来自SA