For the large Numbers of pollen grains produced by wind-pollinated plants as compared to insect-pollinated plants, see Cruden, R. W. 2000.
有关风媒传粉的植物花粉粒数量大于虫媒传粉植物的数据,见Cruden, r . W . 2000。
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"We're ratcheting up our efforts in southern Africa since this is where so much of the illegal rhino horns and other materials come from," Mr. Cruden said.