frailness

例句：

1. 1. The old man's frailness made him easily tired.
   老人的虚弱让他很容易感到疲惫。
2. 2. Thebaby's frailness was evidentin his clumsy movements.
   婴儿的虚弱在他那笨拙的动作中显而易见。
3. 3. Theelderly woman's frailness madeit difficult for her to walk without assistance.
   这位年迈女士的虚弱使她在没有帮助的情况下行走很困难。