3.In ancient times, we began to introduce exotic species into our own land,such as corn,broomcorn,potatoes and so on.
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What's worse, many cocoa farmers in Africa and other cocoa producing countries like Indonesia and Venezuela are changing to easier to grow crops such as corn or rubber.
更糟糕的是，非洲和印尼、委内瑞拉等其他可可生产国的许多可可种植者正在改种玉米或橡胶等更容易种植的作物。
Intensively farmed areas like northeast Brazil and Mexico are likely to see their prime growing seasons fall below 120 days, which is critical for crops such as corn to mature.
巴西东北部和墨西哥等集约化养殖地区的最佳生长期可能会降至120天以下，这对玉米等作物的成熟至关重要。
Machines have largely taken over planting, watering and harvesting crops such as corn and wheat, but the monitoring of cattle has gone through fewer changes.
机器在很大程度上接管了玉米和小麦等作物的种植、浇灌和收割工作，但对牛的监测变化较少。
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