The coat was a real buy.
这件衣服买得真划算。这件衣服物超所值。
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作为名词,buy的含义是,something that is underpriced; a bargain(合算的购买,便宜货)。
例句:
It's a real buy at that price. 以那个价钱真的是物超所值。
海纳百川,有容乃大;壁立千仞,无欲则刚。