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重点讲解：
1. take part in 参加；参与；
All the students take part in this game.
所有同学都参加了这个比赛。
2. on one's own 单独地；独自地；
Tom's wife died, leaving him to raise the family on his own.
汤姆的妻子去世了，留下他一个人独自抚养家庭。
3. stand up for 坚决维护；捍卫；
You need strength of mind to stand up for yourself.
你需要用精神力量来支持自己。
4. care about 关心；在乎；在意；
I don't care about money, looks or power.
我不在乎金钱、外貌和权力。
n. 合作，通敌
