名词
中文翻译：海拔保持同义词
同义词：
['altitude hold', 'altitude hold down', 'altitude hold steady']
例句：
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1. The pilot successfully landed the plane at an altitude of 30,000feet.
飞行员成功地将飞机在3万英尺的高空降落。
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2. During the ascent, the climber maintained a constant altitude hold to conserve energy.
在上升过程中，攀岩者保持恒定的海拔高度以节省能量。
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3. The mountaineers were instructed to maintain a stable altitude hold during the descent.
山地探险者被指示在下降过程中保持稳定的海拔高度。