A new formula on the action sphere of reel slat is driven out through the graphical analysis of reel slat motion locus in this paper.
本文利用图解法分析了拨禾轮的运动轨迹，并推导出新的拨禾轮作用范围的公式。
The explosion wave which blow up underwater has a proper lethal action on Marine organisms, but the lethal sphere is not big and there is bigger harm on their larva, egg and plankton.
水中爆破所产生的声压波对海洋生物有一定的致死作用，但致死范围不大，而对水产资源的幼体和浮游生物伤害较大。
Compared the literature of Hunan in the Tang Dynasty with before, the quantity of native writers and from other parts increase and the sphere of action is expanded.
唐代的湖南文学与以前比较，本土作家和流寓的外籍作家增多，作家的活动范围和文学所反映的社会生活层面得到扩展。
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