The left side was shot at f/22: The torch is in focus, and you can make out the tree and the house behind it. That's a large DOF.

仔细观察一下这张有一盏落地式火炬灯的照片，左侧是在f/22的光圈拍摄的：火炬灯为焦点，你可以看出背景中的树木和房屋，这就是我们说的大景深。

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Phylogenic tree from 29 strains were draw based on the NDV HN gene (part segment), and the result is similar to that of F gene.

根据29株NDV HN基因部分编码序列绘制NDV系统发育进化树，发现F及HN基因的分型结果大致相同。

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The results of the experiment shown that the F in tea plants taken up from the soil was mainly transported to the leaves and its content accounted for about 90% of the whole tree.

结果表明，茶树从土壤中吸收的氟，主要向叶片运输，根、茎部基本不积累氟，溶液培养试验也得到了同样的结果。

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