GPS是全球定位系统的简称，是利用导航卫星进行测时和测距的系统。

GPS is the abbreviation of Global Positioning System, which USES the satellite to navigate and measure location.

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中国人将“春节期间的运输”简称为“春运”，它是对中国交通运输系统的年度考验。

Transportation during the Spring Festival, called chunyun in Chinese, is an annual test on China's transportation systems.

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在位于圣迭戈的美国海军空间与海战系统司令部(简称SPAWAR)，一个拥有30多名工程师的小组，正设法解决上述问题。

At the American navy's Space and Naval Warfare Systems Command (known as SPAWAR for short), in San Diego, a team of more than 30 engineers is trying to solve such problems.

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