Pollen is an essential food source for the hive and its commercial collection is restricted by the bees' needs.

花粉是蜂箱里所必需的食物源，它的商业性收集受制于蜜蜂对花粉的需求。

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Pollen is an essential food source for the hive and its commercial collection is restricted by the bees' needs.

花粉是蜂箱里所必需的食物源，它的商业性收集受制于蜜蜂对花粉的需求。

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