equivalent same; equal:相等的;相当的;等值的 erect upright; standing straight up on end:直立的;竖直的 erode to eat into; wear or rub away:蚀;腐蚀;侵蚀 ..
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挑一把竖直的椅子,坐好,保持脊椎的挺直。
Choose an upright chair and sit well back so that your spine is straight.
向量场是竖直的。
竖直的墙面上安装了屏幕,看起来像赤褐色的网孔。
The vertical faces are dressed with screens which look like a terracotta mesh.
For most of us, gravity acts this way, defines a vertical direction very naturally and the blackboard is oriented this way, so very natural to call that x and call that y and line up our axes.
对我们多数人来说,重力作用下,很自然地确定了竖直方向,而我们的黑板又是这个指向的,所以很自然地定出 x 轴和 y 轴,并标出我们的坐标系
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