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| 土壤厚度 | |||
| 土层深度; 土壤深度 | |||
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| 土壤深处 | |||
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depth of soil : 18 phrases in 4 subjects |
| Agriculture | 5 |
| Bridge construction | 4 |
| Hydroelectric power stations | 2 |
| Technology | 7 |
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