英语词汇“positive cause”的翻译、意思、用法、释义-英汉汉英双解词典

词汇	positive cause
释义	positive cause 基本例句实际原因 The actual cause of melasma is unknown, but it is known to be related to both hormonal levels and exposure to sunlight.黄褐斑的实际原因还不清楚，但它是已知的有关这两个激素和暴露于阳光下。
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