在某个星期五的晚上，一个工程师在上面写下了一个有关我们广告系统中令人费解的细节问题。
On a Friday night, an engineer went to the board and wrote down the details of a convoluted problem we had with our ads system.
“今天真是个好日子，”SpaceX的创始人兼CEO ElonMusk说。工程师在将来的几天里仔细研究星期五测试的数据。
Engineers will spend the next few days carefully reviewing data from Friday's test.
到星期五，工人们将会完成这个广场的工程。
到星期五中午，他们就在这个工程上干了7天了。
By Friday midday, they will have been working on it for seven days.
到星期五中午，他们就在这个工程上干了7天了。
By Friday midday, they will have been working on it for seven days.
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