悬停坑试验是机载STOVL系统测试开始前最后一系列地面测试。
The hover-pit tests are the final series of ground tests before airborne STOVL testing begins.
在2001年，美国航空航天局启动了试验性的的“点击研究者”项目，这一工程用来定位火星表面的坑状物并加以进行分类。
In 2001 NASA created the experimental Clickworkers project to locate and categorize craters on the surface of Mars.
4月，洛克希德·马丁公司沃斯堡工厂的“悬停坑”对首架短距/垂直起降F-35B隐形战斗机的垂直着陆方式进行测试试验。
The first F-35B short takeoff/vertical landing stealth fighter operates in vertical-landing mode on a special "hover pit" at Lockheed Martin in Fort Worth, Texas, during an April test.
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