Objective Explore the method for the estimation of sample size in two stage cluster randomization tirals.

We also find that response-adaptive randomization procedure can reduce sample sizes significantly in clinical trials.

通过比较还可以发现反应自适应随机化设计可以有效地减少所需样本量.

Furthermore, the relationship between randomization deceleration probability and the traffic density was taken into account.

同时, 考虑了交通密度对随机慢化概率的影响.

Methods parallel group, stratified randomization, double blinded, muti-center clinical trail was designed.

方法采取平行组设计 、 分层随机 、 双盲 、 多中心临床试验方法.

Six authors of RCT replied and four of them provided more information on methods of randomization.

与纳入研究的作者联系,有6位RCT作者 回复,其中4位提供了随机方法补充信息.

As more sweatshops open, more alternatives are available to workers raising the firmbid to hire them.

越多的血汗工厂开办, 工人的选择就越多,这将有助于提高工资.

But global campaigns against sweatshops make that less likely.

但是全球范围内的反对血汗工厂运动让一切变得渺茫.

Eg : The sweatshops could learn a thing or two.

这种血汗工作可以学到点东西.

Would it be a shuttle for Chinese seamstresses heading off to work in Italian sweatshops?

难道它将是为中国远赴意大利血汗工厂工作的女裁缝们准备的穿梭快车?

Many children are worked to death in sweatshops.

许多孩子被血汗工厂累垮了.

Every race meeting they attended they took the podium in one category or another.

每场他们参加的比赛,总有人站上领奖台,不管公开组或其他.

The Epsom race meeting was an important social event.

埃普瑟姆的赛马会是一项重要的社会活动.

The first race meeting , for motorcycles, took place the following year.

首届摩托车的比赛盛会在第二年开始举办.

Metamathematics is a subject on symbolic logic, which focuses on the mathematics discrepancy.

元数学是一门数理逻辑方面的学科, 其主要研究对象是数学本身的矛盾性问题.

Of or relating to symbolic logic.

熟练于逻辑符号的人.

What times does the swing shift begin and end?

中班何时开始何时结束?

I hate getting up early, so I prefer the swing shift.

我讨厌很早起床, 所以比较喜欢上中班.

a shallow pool for non-swimmers

供不会游泳的人用的浅水池

The swimmer was swept away by the current.

那个游泳的人被激流卷走了.

a good/strong swimmer

水性好的人；擅长游泳的人

Bill is both a good swimmer and a good cook.

比尔不仅是个游泳好手,而且是个烹调能手.