The latest launch, to test key technologies and gather data, is China's second lunar mission.

最新一次发射，是为了测试关键技术与收集数据，是中国的第二次探月发射。

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The star simulator instrument is an important test equipment on the ground of star sensitivity instrument which is a stance test key component in planet control system.

星模拟器是卫星控制系统中姿态测量关键部件——星敏感器的一项重要地面试验设备。

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Have key users test the applications on all daily, weekly, and monthly functions.

让关键用户测试每天、每周和每月会用到的应用程序功能。

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"This is a key test, not just for the black vote, but also a key test for the Democrats in terms of heading South, " she said.

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The Lean Startup approach essentially attempts to help entrepreneurs identify and test their key hypotheses about a business by radically shortening the development cycle using what Eric has labeled a minimum viable product.

FORBES: The Mystery of Repeatable Innovation and the Startup Lessons Learned Conference

The mild winter sets the sector up for a key test of underlying demand.

WSJ: Mild Winter Could Help Home Depot Earnings