half-mast

n.

半旗（旗杆中央的位置）；

adj.

半旗的；不到顶的；

vt.

下半旗；

at half-mast(潜艇)露出半段通气设备

1. Flags were (flown) at half-mast everywhere on the day of the king's funeral.
   国王安葬那天各处都下了半旗。

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