重点讲解：
1. don't give up the day job 不要放弃正职；
例句：It's a kind way of telling aspiring novelists, 'Don't give up the day job'.
这是劝诫立志成为小说家者“不要丢了正业”的一种温和方式。
2. be good at 擅长的；精通的；能干的；
例句：The soldier was good at playing fife.
这名士兵善于吹笛子。
3. rather than 而非；胜于；而不是；
例句：She is a career woman rather than a housewife.
她是职业妇女而不是家庭主妇。
4. stick to 坚持不变；
例句：Perhaps he should have stuck to writing.
也许他还是一心放在写作上来得保险。
5. concentrate on 全神贯注；集中（心思）；
例句：She couldn't concentrate on a book very long.
她不能长时间专心读一本书。
