It takes a month for the body to make antibodies to a newly encountered pathogen, so a bunch of immune-system cells called B lymphocytes first fire back in a general way.

新的病原体进入机体后，机体一般需要一个月的时间才能产生相应的抗体，因此首先由免疫细胞——B淋巴细胞通过共同途径对病原体进行攻击。

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For example, let us consider a SOAP message going from a service client to a service provider through Intermediaries a and B (see Figure 2).

例如，我们来考虑这样一条SOAP消息，它从一台服务客户机经由中介体a和b传送到服务提供者(请参见图2)。

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A number of studies have tried and failed to find a benefit, like a recent one that randomly assigned 5, 442 women to take either a placebo or a B-vitamin combo.

大量的试验试图表明它的好处，但都失败了，就像最近的一次研究，5,442名妇女被随机分配服用安慰剂或是维生素b。

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An A is worth four points, a B three points, a C two points and a D one point.

VOA: special.2009.03.05

a You know that what will happen is that heat will flow from a to b from b to c and from a to c. That's common-sense.

你知道会发生的是热量从流向,从流向,以及从流向。

麻省理工公开课 - 热力学与动力学课程节选

In the case of France again, they are the work of a brilliant military engineer called Vauban, v-a-u-b-a-n.

例如法国,在佩皮尼昂 里尔 蒙梅迪等地方,这样的要塞城镇随处可见

耶鲁公开课 - 欧洲文明课程节选

Absent health care reform, do you have a plan B or a second stimulus?

WHITEHOUSE: Press Briefing

Berkshire Hathaway A and B shares had a mixed session, a day after hitting record highs.

FORBES: Street Shrugs As Clock Ticks Toward Sequester

"You may not get from A to B in a straight line, " he added.

BBC: Smith gears up for epic boat race