大师
芥末
必须
明白
mustard [ˈmʌstərd]
n.芥末酱；芥；芥菜；芥末黄；褐黄色
例句：He dropped his sausage on the pavement and someone's dog ate it, mustard and all.
句意：他把香肠丢在人行道上，不知是谁家的狗将香肠甚至连带芥末都吃个了精光。
