照顾新生儿几个月后，她显得疲惫不堪。

After months of caring for the newborn, she looked completely ___worn-down.

这把刀的刀刃已经磨损得很钝了。

The blade of this knife has become ___worn-down from years of use.

经过数月的激烈竞争，他们的意志终于被消磨殆尽了。

After months of intense competition, their determination was finally ___worn down.