光电学英语词汇第88页 ... stopposition光阑位置 stopring止环 stopscale光阑刻度盘 ...
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研究表明：桦属和松属在表土中的花粉百分含量大于群落中植物的盖度，具超代表性；
This research demonstrated:Surface pollen content of Betula and Pinus is much more than their coverage in community, so they have extra representation;
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