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| 双重梁; 双光束; 位干屋架下弦上面的系梁; 柁架的二梁; 二柁; 位于屋架下弦上面的系梁; 柁架的二梁二柁 | |||
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| 双射束的 | |||
| double beam: 121 phrases in 16 subjects |
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