在必要时，您必须确保每一层可以随着用户负载的增加而按一定的比例增长，并且每一层允许在故障转移时继续可用。

You must ensure that each layer can scale as user load increases, and that each layer allows for continuous availability with failover, if necessary.

youdao

尽管有些支出，按gdp的比例有过小幅增长，但毕竟奏效了，事实摆在那里，先减税。，但好景不长，到2001年就不行了。

Some spending has gone up a little bit as a proportion of GDP... But it worked. It did work. You cut the taxes... But it then fell apart in 2001.

youdao

按比例看，该等增长大于人口或登记机动车辆的增长。

Such increases were proportionately greater than the growth in population or in the number of registered motor vehicles.

youdao

Some spending has gone up a little bit as a proportion of GDP ... But it worked. It did work. You cut the taxes... But it then fell apart in 2001.

尽管有些支出，按GDP的比例有过小幅增长,但毕竟奏效了，事实摆在那里，先减税。,但好景不长，到2001年就不行了。

斯坦福公开课 - 经济学课程节选