第九课你有时间吗？
The father let his son have a rest before moving to Lesson Nine.
那位爸爸让儿子在进行第九课之前休息休息。
Rescuers got a stark lesson after Utah's Crandall Canyon mine collapse in 2007, when nine people died. Only one mobile robot made it down a borehole and onto the mine's floor.
在2007年犹他州的CrandallCanyon矿井崩塌事故中，机器人营救员们就遇到了这样的尴尬：在这起有九人丧生的事故中，仅有一台移动机器人完成了地底钻洞和矿井登录的工作。
In lesson number nine, our next less than, I'm going to talk about leaving work at the end of the day.
在第九课中，我们的下一个课中，我将在一天结束时离开工作的有关情况。
They were having an English lesson at nine o 'clock last Tuesday morning.
上星期二早晨九点，他们正在上英语课。
They were having an English lesson at nine o 'clock last Tuesday morning.
上星期二早晨九点，他们正在上英语课。
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