The airplane must be guided, is driving, so that it not only go left or right, but also can fly upward or downward.
飞机必须被制导，即被驾驶，使它不仅可向左或向右而且也可向上或向下飞行。
The airplane must be guided, is driving, so that it not only go left or right, but also can fly upward or downward.
飞机必须被制导，即被驾驶，使它不仅可向左或向右而且也可向上或向下飞行。
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