be busy的用法及搭配

　　例句：

　　Most seem happy to be busy.

　　大部分看起来愉快而忙碌。

　　She's going to be busy for 20 years.

　　她将要忙活20年才会得空。

　　They'd be busy for thousands of years.

　　因为这需要它们数以千年的工作量。