Here's a piece of cake and a small coffee for you, sir.

　　先生，這是給您的一塊蛋糕和一小杯咖啡。

　　There was only one piece of cake, but we cut it in two.

　　只有一塊蛋糕，但我們把它切成兩半兒。

　　Don't think this job a piece of cake. You'll have to rack your brains once you start on it.

　　別以為這工作是易如反掌的事，你做了就知道它是很傷腦筋的。

　　Learn English is a piece of cake.

　　學英語是小菜一碟。