在本文中，我们给出了一些简单平面图的群染色数。

In this paper, we give some group chromatic of simple planar graphs.

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但不久后一群公司发现售卖专用软件是一笔有利可图的生意。

But companies soon discovered that selling proprietary software can be a very profitable business.

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然而最近数十年，即便在雨季，雨水也越来越少了。图阿·格雷人尽力维持畜群的规模。

But in recent decades, as less and less rain fell during the wet seasons, Tuareg families struggled to sustain sizable herds.

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This inner cell mass develops into the embryo, which this here shown at a later stage is beginning to be clear that it's becoming an organism that looks like us.

内细胞群发育成为胎儿,这张图这是一个相对晚期的阶段,能越来越清晰地观察到,这团东西开始有个人形了

耶鲁公开课 - 生物医学工程探索课程节选