重点讲解：

1.check out检查

Maybe we ought to go down to the library and check it out.
也许我们该去图书馆调查一下2A8A%TZ+R[!+ao。

2.communicate with交流

Dolphins use sound to communicate with each other.
海豚用声音相互沟通TG9O^D*C7lm+)ELkF。