I learned to protect themselves, as a child I know one way to avoid being rejected, the best way is to refuse others first.

从小我就懂得保护自己，我知道要想不被人拒绝，最好的办法就是先拒绝别人。

youdao

Many have assumed that humans ceased to evolve in the distant past, perhaps when people first learned to protect themselves against cold, famine and other harsh agents of natural selection.

很多人认为，在遥远的过去，人类通过了饥饿、寒冷等自然选择的严峻考验后，便不再进化了。

youdao

During this time, about 5,000 students have learned how to protect themselves.

在此期间，大约5000名学生学会了如何保护自己。

youdao

Ranger Nic Bullivant said snow-holing had traditionally been a life-saving skill learned by mountain guides, rescue teams, walkers and military personnel to protect themselves in bad weather.

BBC: Lav in a cold climate: 'Free range toileting' etiquette