名词
中文翻译：投影仪的杆子
同义词：
['projection pole', 'projection rod']
例句：
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1.The projector was placed on the desk to project images onto the wall.
投影仪被放在桌子上，用来在墙上投射图像。
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2.The teacher used a projecting pole to demonstrate the concept of gravity.
老师使用一个投影仪来演示重力的概念。
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3. The engineer used a projecting pole to measure the distance between two points.
工程师使用一个投影仪来测量两点之间的距离。