"use your loaf" used to tell someone in a slightly angry way to think more carefully about what they are doing (用于表示对某人思考问题欠认真而稍为恼火时)多动动脑子，好好想想 在第一次世界大战中，士兵们会挖战壕，躲在里面几天，直到枪声减少或停止。这时，如果士兵想出来，他不可能直接冒头，所以就想出了先用一块面包伸出来，测试一下看看狙击手是否还在附近。loaf本意“一条面包”，后来就引申为脑袋的意思。 Use your loaf. Use your loaf of bread. Bread = head. Use your head. Jenny finally remembered to bring the right books home to do her homework. I'm glad she's finally using her loaf. 珍妮终于记得带对的书回家做作业了。我很高兴她终于动脑子了。