The four-function calculator now turns into a scientific calculator when you rotate the phone 90 degrees.

现在你只要将手机旋转90度，普通功能的计算器便可以变成一个科学计算器。

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Message type indicator (MTI) — Four numeric digits that specify the version of the ISO8583 standard, message class, message function, and message origin.

消息类型指示符(MTI)——4个数字，指定ISO 8583标准的版本、消息类型、消息功能和消息的发起位置。

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The line function takes four arguments, representing the points between which a line is drawn.

line函数接受四个参数，代表的是要在其间绘制线条的点。

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- The same place is that energy is a function of these four quantum numbers.

它就是这个结论,能量是这四个量子数的机能显示。

麻省理工公开课 - 固态化学导论课程节选

The four-engine Yun-20, or Transport-20, is a huge, multi-function airfreighter that can perform various long distance air transport tasks targeting cargo and passengers, the state-run Xinhua News Agency said.

CNN: China's new super cargo jet takes to the skies

The organisation said it had discovered that four other categories of outflows - for example at pumping stations or waterworks - perform the same function, bringing the total figure to an estimated 31, 000.

BBC: Charity warning over raw sewage discharge levels