0 a glass container filled with sand that takes one hour to move from an upper to a lower part through a narrow opening in the middle, used especially in the past to measure time -- （用于计时的）沙漏
The eternal hourglass of existence is turned upside down again and again, and you with it, speck of dust !
For one, elaborately modeled image censers and censer stands abruptly ceased to be used, and spiked hourglass and ladle censers were adopted.
The imploded target develops an hourglass shape that effectively isolates the marker layer for diagnostic imaging.
The center is driven more energetically and creates an hourglass shape to the imploded ablator shell.
According to its shape the ducts were divided into three distinct types: tunnel, hourglass and window.
Our teleomeres are shortening, the hourglass is emptying of sand.
The occlusion rate was less in ductus of hourglass shape (80%) and worst in those of window shape.
The transverse views demonstrate an hourglass-shape to the imploded target.
