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| 关税壁垒 | |||
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| 夹极墙 | |||
| 止水墙; 防水墙 | |||
| 隔墙; 围墙; 屏障 | |||
| 阻隔墙 | |||
| 关税壁垒 | |||
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barriers wall : 4 phrases in 2 subjects |
| Technology | 3 |
| Wind Energy | 1 |
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