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| 顶上投影仪 | |||
| 高射投影仪 | |||
| 透明片投影机; 投影机 | |||
| 高架投影仪; 高架投影机; 投影幻灯机 | |||
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overhead projector : 1 phrase in 1 subject |
| Technology | 1 |
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