有的取量子有效作用量 quantum effective action
也就是说，有必要存在一种让开发工程师更快更有效的做测试的工程作用。
Specifically, engineering roles that enable developers to do testing efficiently and effectively have to exist.
这就是为什么给失业者帮助是一种有效刺激；这也说明削减低收入工人的税收对增加需求是有相应作用的。
That's why aid to the unemployed is an effective stimulus; it also suggests that tax cuts for lower-income workers will be relatively effective at raising demand.
控制光合作用的叶绿素呈现绿色也是有原因的——它反射了绿光，与太阳的光谱保持一致，这样它才能最有效地吸收阳光。
It is tuned to the spectrum of the sun in order to absorbsunlight in the most efficient way possible. The reflected green is the lightit rejects.
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