A new formula on the actionsphere 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。
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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.
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.