Zhang is one of the most common surnames in China.

“张”是中国最常用的姓之一。

By contrast, 70, 000 surnames cover 90 percent of Americans.

与此相对比的是，90%的美国人有着7万个姓氏。

In fact, there are only 7 surnames among its current residents.

实际上，在现居者中只有7个姓氏。

Like many surnames, Louis Pasteur's probably once indicated a profession.

像很多姓氏一样，巴斯德的姓氏在过去暗指专业。

Surnames carry some history in that they give an indication of our ethnic origins.

姓氏名包含了他们象征种族起源的来历。