Twice a year, at the Spring and Fall equinox, the Sun rises due east.

一年两次，春分和秋分，太阳从正东方升起。

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It was only at two points in the year that the night and the day were of equal length and that was at the spring or fall equinox.

一年之中只有两次，白天和夜晚的长度一样，即春分和秋分。

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Day and night would each be exactly 12 hours long on a spring or fall equinox only if the sun were a single point of light and Earth had no atmosphere.

如果想要昼夜在春秋分日达到精确地12小时等长，除非太阳是个单点光源或者地球上没有大气层。

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Chevrolet MyLink will be available beginning with the 2012 Chevrolet Volt and Equinox this fall before expanding to other vehicles in the Chevy lineup over the next 18 months.

ENGADGET: Chevrolet launches MyLink smartphone integration for 2012 Volt and Equinox