She says for developing countries to improve their crop output, investment needs to be made in promoting traditional farming techniques.

VOA: standard.2009.10.21

The reason for that is, if you are just engaged in a single crop farming, well you plant it, you take care of it, and then when the times comes you reap it.

其中的原因是,如果只是种庄稼,你先播种,接着你好生照料它们,然后成熟时收割它们

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