他手臂上的红痕是昨天被球砸的。

The red welts on his arm were caused by being hit with a ball yesterday.

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The red welts on his arm were caused by being hit with a ball yesterday.

welts 是名词 welt 的复数形式,welt 指皮肤受到打击或摩擦后出现的红肿痕迹,通常呈条状或隆起状,中文常称为"鞭痕"或"红肿痕"。

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