One disadvantage of this type of gate, however, is that after gate removal a witness marl is left on a visible surface of the moulding.是什么意思_One disadvantage of this type of gate, however, is that after gate removal a witness marl is left on a visible surface of the moulding.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句