I go camping in the mountains to enjoy the fresh air.
我去山中宿营以享受新鲜的空气。
I asked him to go to the store, but he wouldn't
我请他去商店,但是他不肯。
It was not forced upon them by the survival competition; they could have caught and lived on prey without using poison, just as the thousands of non-poisonous snakes still do.