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| 71. | parallel projection |
| 平行投影 |
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| 72. | projected angle |
| 投影角 |
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| 73. | projecting lens |
| 投影透镜 |
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| 74. | upright projectoin |
| 垂直投影 |
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| 75. | projection imaging |
| 投影成像 |
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| 76. | direct projection |
| 直接投影 |
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| 77. | projection spark chamber |
| 投影火花室 |
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| 78. | perspective projection |
| 透视投影 |
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| 79. | bounded projection |
| 有界投影 |
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| 80. | optical projection |
| 光学投影 |
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