the low velocity layer exists in a very wide range of the mid-crust. The lowest velocity value is near 5.60 km/s;是什么意思_the low velocity layer exists in a very wide range of the mid-crust. The lowest velocity value is near 5.60 km/s;在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句