It toughened me up when I got older.

在我成长的过程中那使我更坚强。

Another theory is that an immune system toughened up by a barrage of pathogens is less likely to overreact to allergens.

另一个理论是受病原体猛攻后所强化的免疫系统对过敏原较不会过度反应。

It’s said he soon toughened up and fought back, with Silverstein saying his mother didn’t suffer fools, or bullies, gladly.

据说他很快就变得坚强起来并进行了反击，西尔弗斯坦说他的母亲很乐意忍受愚人或恶霸。