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重点讲解：
1. show up 出现；露面；
It was getting late when she finally showed up.
天色已晚，她终于赶到了。
2. prefer to do sth. 更喜欢；偏好；
It is commonly asserted that older people prefer to receive care from family members.
人们普遍确认，老年人更愿意由家人照顾。
3. eavesdrop on 偷听；窃听；
I don't like eavesdropping on people talking on the phone.
我不喜欢偷听人家打电话。
4. rely on 依赖；依靠；
Many animals rely on concealment for protection.
许多动物靠藏匿自己来避害。
n. 警戒，警惕
