研究人员还需要一个成熟的方案来确保飞行器保持正直。
Researchers also need a sophisticated solution to make sure the robot remains upright.
保持正直说真话。
你的身体在水中应该保持正直，挺胸、目视前方，不要过度前倾或伛偻。
Your body should be straight up in the water; don't lean forward much or hunch over. Keep your shoulders back and look straight ahead.
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