If you cheat in a test, you've really only cheating yourself.
如果你在测验中作弊的话,你欺骗的只有你自己。
I need the change for the stamp machine.
我需要投入自动售邮票机的零钱。
One night, the gaoler decided to play a joke on his colleague to find out if, after so many performances, he had managed to learn the contents of the letter by heart.