苏大宝在一个投影师傅的帮助下，用沙子作绘图表演。在沙子构图和舞台表演方面，苏大宝有着丰富的经验。
Performing sketches in the sand with an overhead projector, Su Dabao has extensive experience in both painting and stage performances.
为了帮助我们的销售团队更好地给既有和潜在的客户做演示，我想申请购买一部数字投影仪。
In order to facilitate our sales team in delivering presentations to current and prospective clients, I would like to apply for the purchase of a digital projector.
用投影变换来帮助学习者培养空间想象能力是学习中必用的手段和方法。
It is necessary to learn the method of using projection transformation to train people the ability of spatial imagination.
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