An hourglass is a device that was used to measure the passing of an hour. It has two round glass sections linked by a narrow channel, and contains sand which takes an hour to flow from the top section into the lower one.
英漢詞典釋義
n.
沙漏
an hourglass figure沙漏形的圖形an hourglass design沙漏狀的圖案Once the sands have run out of a person's hourglass, they cannot be replaced.時光一去不復返。