hourglass
noun /ˈaʊəɡlɑːs/
/ˈaʊərɡlæs/
Use an, not a, before hourglass.- a glass container holding sand that takes exactly an hour to pass through a small opening between the top and bottom sections
compare egg timer沙漏(玻璃容器上部的沙子经一小孔漏到下部,全部漏完正好一小时)