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| 1. | hollow door pull |
| 空心门拉手 |
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| 2. | air core transformer |
| 空心变压器 |
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| 3. | Tesla coil |
| 泰斯拉(空心)变压器, 泰斯拉线图 |
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| 4. | hollow shaft sleeve |
| 空心轴套 |
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| 5. | air core reactor |
| 空心电抗器;空心扼流圈 |
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| 6. | Hollow beam |
| 空心梁 |
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| 7. | hollow flint glass |
| 含铅空心玻璃制品，无色空心玻璃制品 |
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| 8. | hollow glass filament |
| 空心玻璃丝 |
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| 9. | Hollow metal door |
| 空心金属门 |
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| 10. | brick cavity wall |
| 空心砖墙 |
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