飞机从一个地面信标到下一个信标曲折飞行,在每一阶段都要经过地面的许可才能上升和下降。
Planes must zigzag from one ground beacon to the next, and ascend and descend in steps at each stage obtaining permission from the ground.
上帝会爱你在每一阶段所经历的恢复与成长。
在每一阶段中,可交付的产品和工作产品是什么?
What are the deliverables and work products within each phase?
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