- Hair's natural shine is supplied by its own conditioner, sebum, an oil composed of waxes and fats and also containing a natural antiseptic that helps fight infection. Too much sebum results in greasy hair and conversely, too little sebum makes dry hair.
头发的自然光泽来自它自身的护发素：油脂，它含有蜡和脂肪，还含有抗感染的自然抗菌剂。油脂含量过多会导致油性发质，相反，油脂含量过少则会导致干性发质。
- Conversely, work in applied science and technology frequently acts as a direct stimulus to the development of pure science.
相反，应用科学技术的成果在纯科学的发展中经常起到直接的促进作用。
- Conversely, intelligent beings which are just beginning to develop on remote worlds may be ready to pick up our signals in thousands of years.
反过来说，其他星球上的刚刚开始进化的智力生命，他们要过几千年之后，也许才可能收到我们的信号。
