The backfill shall be transported with machine and rammed with a frog rammer or a vertical rammer, or rammed with a roller in case of allowable situation.是什么意思_The backfill shall be transported with machine and rammed with a frog rammer or a vertical rammer, or rammed with a roller in case of allowable situation.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句