许多食品包装被空运到半个地球以外的地方。

Many food packages are flown halfway across the earth.

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鲸类们有自己的“流行歌曲”，它能传遍半个地球。

Whale songs become "hits" that can spread halfway around the globe.

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GOES卫星系统可以同时观测近半个地球，追踪诸如云层、水汽等天气参数。

The GOES satellites see nearly a full hemisphere of the Earth at one time, tracking weather parameters like clouds and water vapor.

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So you can imagine that adds real excitement and energy to the class and puts a little bit pressure on the professors to make sure that we have something worth coming half way around the world for.

可以想象,为课堂带去的兴奋和活力,也给教授施加了压力，我们要确保,能传授值得绕半个地球赶来学习的知识。

哈佛公开课 - 幸福课课程节选