Every year I perform hundreds of operations free of cost through Smile Train.
每年我都通过微笑列车免费做几百个手术。
2
The first truly free public library that circulated books to everyone at no cost was started in a small New England town in 1833.
1833年，在新英格兰的一个小镇上，第一家免费向所有人提供图书的公共图书馆成立了。
3
Mr. Obama's plan to curb carbon dioxide emissions, though necessary, will be far from cost-free, whatever his sunny speeches on the subject might suggest.