Sweet tooth 字面意为甜甜的牙齿，有这样的牙齿因为这个人总吃甜食，所以在I have a sweet tooth中，意为很喜欢吃甜食。Have a natural sweet tooth则是天生爱吃甜食的意思。
情景会话:
Ben ：I have a sweet tooth. Chocolate is my favorite. So how about you?
本 ：我喜欢甜食，巧克力是我的最爱，你呢?
Tom : So do I.
汤姆 ：我也是。
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