Solow added technology as outside variable to economic growth model, and the new economic growth theory takes technology as endogenous variable, which is the important factor of economic growth.

索洛在经济增长速度方程中，将技术进步作为外生变量引入经济增长模型。 而新增长理论将技术进步作为经济增长的内生变量，视技术进步为经济增长的重要因素。

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All right. Second question: or maybe a better way of saying this, and the general format you're likely to see here is, a test involving a variable name, which must be initialized outside of the loop, and which interior to the loop gets changed, so that the test is going to change.

好，第二个问题：,换种更好的方式来说吧，你们通常喜欢的,方式是，这个测试涉及到一个变量名字，变量在循环外已经被初始化，然后循环内部会改变这个变量的值，因此测试结果会改变。

麻省理工公开课 - 计算机科学及编程导论课程节选

Even worse, when OPERA ran their experiment for a second time, they only changed one variable, and did not try to address other important criticisms of the initial methodology from both outside and inside the OPERA Collaborative.

FORBES: Leaders Of The 'Faster-Than-Light' Experiment Resign