Once the solid glass object cools, an artist uses special tools to carve an opening in the container.
VOA: special.2009.09.16
But if I see you through the glass, the object is going on some trajectory, which has got both up and down and horizontal motion.
但是如果我透过窗户看到你,这个物体沿着某个轨迹运动,既有上下,也有水平方向的运动
耶鲁公开课 - 基础物理课程节选
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模块上移
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