on time

1.准时
2.【美】以分期付款方式

同：	[r.] not delayed, not late [a.] prompt

in time，on time

这两个词组都可表示“按时”。
in time表示及时。指没有迟到，时间还充裕。
on time表示准时，按时。指按规定的时刻，不早不晚。

at the expected time
- she always arrives on time
[同] not delayed, not late, on time

according to schedule or without delay
- they were always on time
- a prompt reply
[同] on time, prompt

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