Efficient power flow is calculated by means of tree technique and recursion, which do not need resistance or admittance matrix.

运用树的遍历技术进行实用潮流计算，递归方程的使用使得编程简单，并且不需要形成阻抗阵或导纳阵。

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According to the flame retardancy of bark and the fire resistance of the 5 tree species, we commended forest fire protection measures correspondingly.

根据5种树皮的阻燃性和林木耐火性差异提出相应的森林消防措施。

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In the tree and reed, when the wind comes, and trees and reed and powerless to fight, the tree chose high rise, stout resistance, but still won't stand a dull color. gives.

在大树与芦苇中，当狂风到临，而大树和芦苇又无力抵抗时，大树选择了挺胸仰面，坚强抵抗，支撑不住了，但仍硬挺着。

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One of the best-performing retail stocks is Dollar Tree ( DLTR), which broke through two-month resistance, line e, on Monday.

FORBES: Retail Sector Is on the Move