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重点讲解：
1. on duty 上班；值班；
There will only be a skeleton staff on duty over the holiday.
假期将只留必需的少数职员值班。
2. depend on 依靠；依赖；
Many adults still depend on their children to work the video.
很多成年人仍然要靠孩子来操作录像机。
3. be admitted to 接受（入院）；收治；
A toddler was admitted to the emergency ward with a wound in his chest.
一个蹒跚学步的小孩因胸部受伤被送进急救室。
4. as soon as 一…就…；
As soon as he gets here we're ready to go.
他一到我们就可以开始。
n. 适合度（生物学术语） n. 健康
