You have a pre-defined variable named total_time for the wall-clock time of the whole data collection.

有一个预定义的变量 total_time，它代表整个数据收集过程的时钟时间。

youdao

For example, the experiment could be tossing a coin, I will call the outcome heads the number one, and I'll call the outcome tails the number zero, so I've just defined a random variable.

比方说,抛硬币的试验,我将正面向上的结果对应数字1,反面向上的结果对应数字0,这样我就定义了一个随机变量

耶鲁公开课 - 金融市场课程节选

Worst still are the high cost variable annuities with mutual fund clones that pervade the governmental defined contribution plans.

FORBES: An Extreme Makeover Due For Defined Contribution Plans: 401(k), 403(b) and 457s All Under Attack (June 1, 2007)

There is simply no reason why defined contribution investors should be paying retail mutual fund fees or investing in tax deferred variable annuities offering illusory insurance protection.

FORBES: An Extreme Makeover Due For Defined Contribution Plans: 401(k), 403(b) and 457s All Under Attack (June 1, 2007)

With markets volatile and corporations scaling back defined-benefit pension plans, those in or near retirement are paying high fees to transform plain old variable annuities into a source of guaranteed income for life.

WSJ: Cheaper Annuities With Living Some Benefits