weak neutral current

例句：

1. 1. The old man was too weak to walk.
   老人太虚弱了，走不动了。
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 feed himself.
   婴儿太虚弱了，无法自己进食。