宇宙的一条基本法则就是物质不灭定理，体积缩小质量是不会改变的。
A fundamental rule in the universe is that mass cannot be destroyed, so making something smaller doesn't mean it will be lighter in weight!
该模型认为，当主干与侧枝的截面积之间存在类似平行四边形法则的关系时，分枝的体积取极小值。
This model suggests that, when the relation "parallelogram rule" exists between main stem and sub branches, the total volume of branches is minimal.
测体积组将鼠脑经TTC染色后，用计算机病理图象分析仪测量出梗死面积，根据梯形法则计算出梗死体积及梗死体积比。
The rat brains of the group measured volume were dyed with TTC and measured the area by computerized pathological image analyzer.
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