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| 71. | crop hybridization |
| 作物杂交育种 |
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| 72. | subsistence crop |
| 口粮作物|自种自食的作物 |
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| 73. | "From north to south, were the three regions: nomadic, dry farming and paddy regions." |
| 从南至北展开3个经济区:北方草原游牧区、黄河流域的旱地作物区、南方水稻栽培区。 |
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| 74. | nurse crops |
| 保护作物 |
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| 75. | genus of beetles whose grubs feed mainly on roots of plants; includes several pests of cultivated grasses. |
| 其幼虫主要以植物根为食的一种甲虫；包括一些禾本科栽培作物的害虫。 |
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| 76. | melon crop |
| 瓜类作物 |
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| 77. | The scientific study and cultivation of fruit. |
| 果树栽培学对果树的科学研究和栽培 |
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| 78. | gramineous crop |
| 禾本科作物 |
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| 79. | field management of crop |
| 作物田间管理 |
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| 80. | a low-yielding crop; a light bearer |
| 低产作物 |
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