weak complete space

例句：

1. 1. The old man was weak from lack of sleep.
   老人因为缺乏睡眠而身体虚弱。
2. 2. The team's performance was weak in the final quarter.
   球队在最后一刻的表现很弱。
3. 3. The child was too weak to walk by himself.
   孩子太虚弱，无法自己走路。