明槽砌石旋

in the mouth of down in the mouth roof of the mouth open pit look a gift horse in the mouth leave a bad taste in the mouth open pit incineration propeller shaft lining take the bread out of sb.'s mouth take the words out of sb.'s mouth laugh on the wrong side of one's mouth in the cause of in the mouth of mining shaft and open-pit lining of shaft down in the mouth Retromolar area of mouth area of rivet shaft flat feeling in the mouth angle of the mouth corners of the mouth shaft lining shaft mouth