重点讲解：
1. tend to do sth. 往往会；经常就；
例句：Like causes tend to produce like results.
类似的原因往往产生类似的结果。
2. swear by 极其信赖；对…推崇备至；
例句：Many people swear by vitamin C's ability to ward off colds.
许多人深信维生素C能预防感冒。
3. sort of 有几分；近似；有那么点儿；
例句：I guess he's sort of a miser like most bachelors.
我想他一定是个吝啬鬼，象大部分单身汉一样。
4. be interested in 感兴趣的；有兴趣的；关心的；
例句：I think you may be interested in our new product.
我想贵公司可能会对敝公司的新产品感兴趣。
