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N-VOC
(尤用作对自己小的人的爱称)亲爱的，小宝贝儿
You can call someone sweetie if you are fond of them, especially if they are younger than you.
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N-COUNT
好心人;善人
If you say that someone is a sweetie, you mean that they are kind and nice.
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N-COUNT
(儿童用语)糖果
Sweets are sometimes referred to as sweeties by children or by adults speaking to children.