Learner's definition of O'CLOCK
: according to the clock —
used when the time is a specific hour(用于表示整点)…点钟 -
It's three o'clock in the afternoon. [=it's three p.m.]现在是下午三点钟。
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She was 10 minutes late for her 8 o'clock appointment.约会是在8点钟。她迟到了10分钟。
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Be here at nine o'clock, not at nine fifteen.九点到这儿,不是九点一刻。