Apple also introduces system 7, a major upgrade to their operating systems, bringing in color and updates on their software.

苹果同时也发布了7系统，这是一个他们在操作系统的最新更新，具备多种色彩，并更新了它们的软件。

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Public schools were organized into one system of comprehensive schools for ages 7 through 16.

公立学校被组织成一个为7至16岁学生服务的综合学校系统。

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You have in chapters 1 through 7 the sacrificial system.

到7章节讲的是献祭系统。

耶鲁公开课 - 旧约导论课程节选

If we need a 7, this is the ones column, the twos, fours, eights, so here are our columns and this was our decimal system a moment ago, and I wanna express the number 7 and the only digits 0 I now have access to are zero and one, whereas, in decimal, dec meaning 10.

如果你需要7，这是一位，二位，四位，八位，这是位数,刚才说的十进制的位数，我想表达7而且,只能采用数字1与，在十进制中，dec意思是十。

哈佛公开课 - 计算机科学课程节选

They will still be able to do so, but may still face a tax charge for the time still in the system since 7 January.

BBC: Child benefit changes take effect

Finally, Microsoft could integrate the Skype calling service into its own operating system Windows Phone 7.

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The latest version of its operating system, Windows 7, is selling faster than any prior one--175 million so far.

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