9. I'll call back later.
我稍后再打。
还能这样说：
I'll ring again later.
I'll call her later.
应用解析：
later on 后来，过些时候；
no later than 不迟于；
sooner or later 迟早
10. Sorry, the number you dialed is not answered for the moment, please redial later.
对不起，您拨打的电话暂时无法接通，请稍后再拨。
还能这样说：
Sorry, the number you dialed is busy now, pleae dial again later.
Sorry, you can't get the person you dialed at this time. Please redial later.
应用解析：
big number 要人，大亨；
by numbers 依靠数量上的优势；
in round figures 以整数表示、大概，总而言之；
make one's number 报到，拜访
11. How can I get in touch with him?
我怎样才能和他取得联系？
还能这样说：
How do I connect him?
Can you tell me his contact information?
12. I have no idea when he'll be back.
我不知道他何时回来。
还能这样说：
I don't know when.
I wasn't told about it.
应用解析：
at the idea of 一想起……就；
great idea 高见，妙策；
buck one's idea up 更加清醒，更加警惕