大小 (dà xiǎo) means “dimension; magnitude; size; measurement; large and small; at any rate; adults and children; consideration of seniority”. It is an HSK 2 Chinese word in the HSK 3.0 vocabulary.
这件衣服大小正合适。
Zhè jiàn yīfu dàxiǎo zhèng héshì.
This piece of clothing is just the right size.
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