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重点讲解：
1. be better off doing sth. （用于建议）不如，最好；
If you've got bags you're better off taking a taxi.
你要是大包小包的，不如打的算了。
2. at first 最初；起初；开始时；
At first, he seemed surprised by my questions.
起初，他似乎对我的问题感到惊讶。
3. little by little 逐渐地；一点一点地；
In the beginning he had felt well, but little by little he was becoming weaker.
一开始他感觉很好，但慢慢地就变虚弱了。
4. be content to do sth. 愿意；
I was content to wait.
我愿意等候。
adj. 经常的，不变的
n. 常数，恒量
