弱小的

例句：

1. 1. The old man was weak from age and lack of exercise.
   老人由于年老体弱，缺乏锻炼。
2. 2. The team's performance was weak in the crucial match.
   球队在关键比赛中表现不佳。
3. 3. The baby is too weak to walk yet.
   婴儿还太小，走不了路。