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71. | native conformation |
| 天然构象 |
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| |
72. | natural thorium |
| 天然钍 |
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| |
73. | natural water source |
| 天然水源 |
|
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| |
74. | natural bitumen |
| 天然地沥青 |
|
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75. | natural watercourse |
| 天然水道 |
|
|
| |
76. | native compound |
| 天然化合物 |
|
|
| |
77. | naturally alloyed steel |
| 天然合金钢 |
|
|
| |
78. | natural alumina |
| 天然氧化铝 |
|
|
| |
79. | pollution of natural water |
| 天然水污染 |
|
|
| |
80. | natural borneol |
| 天然冰片 |
|
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| |