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重点讲解：
1. worry about 发愁；担忧；
Don't you worry about a thing.
你什么也不必担心。
2. lead to 导致；引起；
This can lead to bodily weakness and muscle wastage.
这样可能会导致身体虚弱和肌肉萎缩。
3. at the same time 同时；另一方面；
I was afraid of her, but at the same time I really liked her.
我害怕她，但同时也确实喜欢她。
4. tend to 倾向于；有助于；
All children will tend to suffer from separation from their parents and siblings.
他已是不止一次被抢劫了。
