每公顷产量持续增加,直至20世纪90年代。
例如,有些水稻新品种每公顷产量是传统品种的三倍。
Some of the new rice types, for example, yield three times as much rice per hectare as traditional types.
自从2000年以来,每公顷产量已经提高大约三分之二。
Since 2000, yields per hectare have risen by nearly two-thirds.
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