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.
这片昔日的农田在1964年前是被用作采砾坑的。
This area of former farmland was worked as a gravel pit until 1964.
液压站在安装前应首先作地基平整处理，并打好地脚螺丝的预埋坑。
Prior to installation of the hydraulic station, firstly level the foundation, and dig the embedded pits for the foundation bolts.
这个坑是在大约2万年前由一座消退的冰川留下的，周围沉积着数以千计的光滑鹅卵石，看起来“就像一只母鸡在下蛋，”赫西说。
It had been carved out about 20,000 years earlier by a retreating glacier that deposited thousands of beach-smooth cobblestones around the hole, "like a hen laying eggs," Mr. Hussey said.
这个坑是在大约2万年前由一座消退的冰川留下的，周围沉积着数以千计的光滑鹅卵石，看起来“就像一只母鸡在下蛋，”赫西说。
It had been carved out about 20,000 years earlier by a retreating glacier that deposited thousands of beach-smooth cobblestones around the hole, "like a hen laying eggs," Mr. Hussey said.
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