Relative risk (RR) was used as a measure of the effect of folic acid supplementation on the risk of stroke with a random effect model.是什么意思_Relative risk (RR) was used as a measure of the effect of folic acid supplementation on the risk of stroke with a random effect model.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句