A heptavalent vaccine protecting against meningitis A and C was licensed in 2007.
预防甲型和丙型脑膜炎的七价疫苗于2007年获得许可。
设x为a加b之和。
Besides, we should take some Vitamins A and B2 regularly.
此外，我们应该定期服用维生素 A 和维生素 B2。
A regular amount of vitamins A and B2 should also be taken.
还应定期服用维生素 A 和 B2 。
More and more people have realized that clear water and green mountains are as valuable as mountains of gold a and silver.
越来越多的人已经认识到碧水青山和金山银山一样珍贵。
Therefore the regular expression A*B will match the strings AB, AAB, AAAB, or any other string starting with an A and ending with a single B.
因此，正则表达式 A*B将与字符串AB 、AAB 、AAAB或任何其它以 A 开头并以单个 B 为结尾的字符串相匹配。
This is true as the above derivation for a and b of opposite parity is an if and only if statement.
这是正确的，因为上面对a和b 的奇偶性的推导是一个当且仅当命题。
比方说，我们将A和B混合。
A你喜欢北海公园吗？
A And the Olympics are coming.
A奥林匹克运动会即将召开了。
Mrs A and Mrs B are knitting gloves.
A夫人和B夫人在织手套。
A那你现在住在哪里？
A你的弟弟呢？
A And then I should see it easily?
A那样我就可以很容易看到奥运会场址吗？
A奥运会即将召开了。
A And then I should find it easily?
a然后我就应该很容易找到它吗？
A And you've lived here since then?
A从那以后你就一直住在这里了？
A而且步行是很好的锻炼！
A而且更潮湿，我想！
A And when will you return to Beijing?
A你什么时候再回北京？
A你工作吗？
How do we minimize this function of a and b?
我们怎么最小化这个函数？
A你妻子呢？
A And you can still find good quality pearls.
A而且你还可以找到质量好的珍珠。
But a and technology has broken media monopolies.
但是由于法规约束和技术改进，媒体垄断被打破。
But a and technology has broken media monopolies.
但是由于法规约束和技术改进，媒体垄断被打破。
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