然而，其在全球麻疹控制计划中的作用需要进一步评估。

However, its role in global measles control programmes requires further evaluation.

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一些评估认为，全球90%的农业种植，在人类起重要作用的生态系统中进行。

Almost 90% of the world's plant activity, by some estimates, is to be found in ecosystems where humans play a significant role.

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