If there is a large piece of dust inside one of the holes, it should be OK to place a toothpick in the hole to remove the dust.
如果在某个吹孔里面有较大的灰尘块，这时用牙签小心将灰尘清理是可以的。
Ok, if we look at it near here, if we walk along this way, the surface is to our right.so, we should actually be flipping things upside down. The normal vector should be going down.
我们看看这里，如果我们沿着这条路走，曲面就在我们的右边，我们应该是把它颠倒一下，这个法向量也应该向下。
Which is why you need to give your body a chance to rest. If you're taking it easy, and only doing 20 minutes, you should be OK without rest days.
如果你只是每天做少量的运动，只锻炼20分钟，那么也许不用专门休息你也没有什么问题。
OK, I understand, There should be no problem, let me confirm it with Nippon Steel. I will come back to you soon.
明白了，应该没问题，让我和新日铁确认一下，回头给你消息。
Ok, you have done very well. Let's come to 3c. You should pretend to be a famous singer or football player. Make your vacation plans and write it down.
好，你们做的非常的好，下面我们来学习3c，在这个教学环节中，你要扮演一个著名的歌星或足球明星，然后把你的假期的计划写下来。
Ok, you have done very well. Let's come to 3c. You should pretend to be a famous singer or football player. Make your vacation plans and write it down.
好，你们做的非常的好，下面我们来学习3c，在这个教学环节中，你要扮演一个著名的歌星或足球明星，然后把你的假期的计划写下来。
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