题目内容
动点的牵连速度是指该瞬时牵连点的速度，它所相对的坐标系是
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牵连运动是以定系为参考体所观察到的动系运动
动系相对于定系的速度为牵连速度。
Which of the four aspects of differences was embodied in the following translation?[洞庭湖衔远山，吞长江，浩浩荡荡，横无际涯。][Carrying distant mountains in the mouth and swallowing the Yangtze River, the vast mighty Dongting Lake stretches endlessly.]
Which of the four aspects of differences was embodied in the following translation?[在四川阿坝藏族自治州的南坪、松潘等县的交界处，有一片纵深30余里的风景区，那就是举世闻名的大熊猫的故乡-九寨沟自然保护区。][Jiuzhaigou, a 30-odd-kilometere-long scenic gully, lies on the border between Nanping and Songpan counties in the Aba Tibetan Autonomous Prefecture, Sichuan Province. It is the natural range of the world-known great panda, as well as a natural reserve designated by the state.]
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