It is no use trying to catch up with the train once it starts.
当火车启动时，设法赶上那趟车是徒劳的。
Once the sugar starts to brown, pay attention. It changes color quickly!
一旦糖变成棕色，就要注意了，因为它的颜色会变化很快！
Once the local PC wakes up, it starts up the network card and configures itself.
一旦本地的PC唤醒，它就启动网卡和进行配置。
Once he starts that, it will take at least six weeks.
即使他开始了恢复性运动，他的回归也至少需要六个星期。
Once he starts that, it will take at least six weeks.
即使他开始了恢复性运动，他的回归也至少需要六个星期。
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