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Birthday Food Around the World around the world 意为“世界各地”。
e.g. He would like to take a trip around the world. 他想环游世界。
The number of the candles is the person’s age. 蜡烛的数量是这个人的岁数。
the number of 意为“……的数目”，当其作主语时，谓语动词应用单数形式。
e.g. The number of the students in our class is forty. 我们班里学生的数目是四十人。
age意为“年龄”。e.g. What’s his age? 他多大年龄？= How old is he?
