知识讲解：
1. but only for a short while.但是只坚持了一会儿。此处while 为“一会儿，一段时间”【拓展】after a while 过来一会儿。In a short while 很快，不久以后
我喜欢午饭后休息一会儿。
2. hunters catch tigers for their fur,bones and other parts of the body.
Hunter 猎人 hunt 射猎
类似的词还有teach work sing dance
clean write speak
3. People kill wolves because they think wolves are dangerous to humans.人们杀死狼是因为他们认为狼对人类有危险。
Be dangerous to somebody 对某人有危险。Human可数名词意为’人，其复数为“humans”
