发音相同，都含有/ɜː/音。

A pound of hamburger, please.请给我一磅汉堡。Put some ketchup on the hamburger.在汉堡上加点蕃茄酱。He proceeded to tell me of my birth.他接着给我讲了我的出生。Mitch was a San Franciscan by birth.米奇是在旧金山出生的。The baby weighed three kilos at birth.婴儿出生时体重为三公斤。