The purpose of this jet is to achieve 12 knots, as opposed to the 7 knots that the unit currently produces with a standard prop.是什么意思_The purpose of this jet is to achieve 12 knots, as opposed to the 7 knots that the unit currently produces with a standard prop.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句