是及时、适时的意思,表示动作“在时间内或提前发生”
We get there just in time. 我们正好及时赶到那儿。
He comes here in time.他及时到达这里。
I got the train in time. 我及时赶上了火车
的按时、准时、按时付款的意思,表示动作必须在规定时间发生,有一定强制性。
You must have class on time.你必须按时上课。
The train came in on time.火车准时进站。
Please come on time. Don't be late. 请准时来,别迟到。