And scientists have been working on this for years and there's been progress, but it's still a very difficult challenge.

科学家们对此已经研究很久了,并取得了进展,但仍有很大挑战

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then yes, you can progress. But there is a limit. There definitely is a limit.

那么你可以继续发展。但是这儿会有限制。限制是绝对有的。

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So more details on sectioning on Friday, but do realize that office hours are very much in progress.

更多细节，尽在本周五,好了，课堂时间宝贵，我们就不多说废话了。

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Well,De Gaulle has been dead for a very long time, and there has been progress, but what has not changed is still the power in Paris, in these ministries, to dictate the life of schools, of almost everything else.

戴高乐已经去世很久,在某些地方已经有所改进,但是巴黎的权利,政府各部门的权利仍未改变,他们规定校园生活,还有几乎其他任何事情

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But think with me just for one second about the idea of progress.

但是请跟我思考一下,进步的观念

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