1·Let x be the sum of a and b.
设x为a加b之和。
—— 《牛津词典》
2·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。
3·A regular amount of vitamins A and B2 should also be taken.
还应定期服用维生素 A 和 B2 。
4·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。
5·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。
6·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。
7·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。
8·So let's say we mix a and B.
比方说，我们将A和B混合。
9·A And do you like Behai Park?
A你喜欢北海公园吗？
10·A And the Olympics are coming.
A奥林匹克运动会即将召开了。