Mm hg
un. 毫米汞柱\\n
?? 詞語組成解析
mm
[?m]
abbr. =megameter;=millimeter;=millimicron;
abbr. 標準德語（High German）；手搖發電機（Hand Generator）
??? 情景例句
When will this time draft fall due?
期票什么時候到期？
I think it's about time we got going.
我想差不多是該告辭的時候了。
and by measuring the time interval between the taps and the receipt of the echoes, the depth of the sea at that point can be calculated.
測出回聲間隔的時間，便可算出該處海洋的深度。