a face as long as a fiddle

1. 板着脸

He came back with a face as long as a fiddle.

他板着脸回来了。

fit as a fiddle

1. 非常健康

He was fit as a fiddle when he came back from abroad.

他从国外回来时身体很好。

play second fiddle

1. 居次位

I have to play second fiddle to him.

我只好给他当副手。