When it was time for him to leave the spacecraft, this is what the world heard: "Roger,Flight,we're GO."

VOA: special.2009.06.24

What was neat about it is before that time, the predominant species to use for air conditioning or refrigeration was ammonia.

在这之前是很整洁的，之前最主要的用于空调或者冰箱的,物质是氨。

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And what we saw last time is that this was necessary to make things work, this part of it in particular.

上节课我们讲,这是对外做功的必要条件，特别是这个部分。

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It is high time we not only think about what is important to us, it is time we do something about it.

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Depending on what is being bought, at what time and how expensive it is, the Wallaby Card selects the best account and charges it.

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When the app is opened for the first time, a sensor that tells the researchers what time of day it is is unlocked.

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