全世界有将近7000种不同的语言。但只有(很)一小部分流行广泛。事实上，仅有4％的人口在用96％的语言。

Sentence No. 1 Walking is a skill people learn as babies. But, it is not as simple as that. Every year, some 15 thousand American pedestrians are killed by motor vehicles.

Sentence No. 4 Nearly 7000 different languages are spoken around the world. But only a handful dominates. In fact, 96 percent of the world’s languages are spoken by just 4 percent of the people.