inure

在开始北极徒步之前，你必须让自己适应严酷的环境。

You must ___inure yourself to harsh conditions before setting out on an Arctic trek.

每天阅读匿名评论会逐渐让一位写作者对尖锐的批评变得麻木。

Reading anonymous comments every day can gradually ___inure a writer to harsh criticism.

教练设计的这些训练旨在让运动员适应极端的身体负荷。

The coach designed the drills to ___inure the athletes to extreme physical strain.