Examples

at 3 o'clock/7 o'clock in the morning

凌晨3点/早上7点 → morning

C₆H₁₂O₆ is the molecular formula of sucrose whereas CH₂O is its empirical formula → empirical formula

血库里的O型血告竭。

The blood bank has run out of type O blood. → 告竭

at five o'clock

5点钟 → at

Be back by ten o'clock.

十点以前回来。 → by

an appointment for two o'clock

两点(钟)的约会 → for

just one o'clock

正好一点钟 → just

nine o'clock at night

晚上九点 → oˈclock

one o'clock sharp

正一点 → sharp

out walking since one o'clock

一点以后就一直在外散步 → since

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