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| 瓶颈问题; 缩径问题 | |||
| 薄弱环节问题 (瓶颈问题) | |||
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bottleneck problem : 4 phrases in 4 subjects |
| Electronics | 1 |
| Information technology | 1 |
| Oil / petroleum | 1 |
| Technology | 1 |
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