You had to constantly adjust the position of your hand to keep the object upright.
你必须不断地调整你的手的位置以保持对象的垂直。
Please keep your seat belt fastened and keep your seat in the upright position.
请系好安全带，并直立您的座椅背。
Keep your seat in upright position during take off.
起飞时请保持座椅呈直立状态。
Keep your head upright, shoulders horizontal, chest broad, back straight.
头容正，肩容平，胸容宽，背容直。
Keep your head upright, shoulders horizontal, chest broad, back straight.
头容正，肩容平，胸容宽，背容直。
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