overhead projector
柯林斯词典
1. N-COUNT An overhead projector is a machine that has a light inside it and makes the writing or pictures on a sheet of plastic appear on a screen or wall. The abbreviation is also used. 高射投影仪
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1. N-COUNT An overhead projector is a machine that has a light inside it and makes the writing or pictures on a sheet of plastic appear on a screen or wall. The abbreviation is also used. 高射投影仪