我们管他叫活字典。
2. He knew his subject from A to Z.
他对自己研究的学科无所不知。
3. There's nothing he doesn't know about photography.
有关摄影就没有他不知道的。
4. He's a computer expert.
他是个电脑专家。
5. We need a strong farm hand.
我们需要一个强壮的田间能手。
6. He is a green thumb.
他是个园艺高手。
7. She's an old hand at dealing with the press.
应对媒体，她是个老手。
