The problem occurs because plants need to transfer pollen by wind and insect to fertilization and reproduction.

这个问题的出现是因为植物需要通过风和昆虫来传递花粉以受精和繁殖。

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The problem occurs because plants need to transfer pollen by wind and insect to fertilization and reproduce.

发生这样的问题是因为植物需要通过风和昆虫传递花粉进行受精繁殖。

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Pollen from a Pistia: Hayfever occurs because plants need to transfer pollen by wind and insect to fertilization and reproduce.

水浮莲花粉：发生花粉热是因为植物需要通过风或昆虫传递花粉进行受精繁殖。

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Gene transfer is an age-old concern of farmers, who've learned how to prevent pollen cross-contamination when necessary for commercial reasons.

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