【经】 自由汇价(率)

free radical

free navigation

free fatty acids

free the network vessels and drain heat

sugar-free culture-medium

distortion-free【电子】;distortionless【电子】;orthoscopic【物】

duration of frost-free period【农】;frost-free period【农】;frost-free season【农】

free the qi4 of the upper burner