今天我们要学的词是 free of charge。Free of charge 免费。The course is offered to students free of charge. 学生可以免费上这门课。Google's VoIP phone service will remain free of charge within the U.S. and Canada in 2013. 2013年用户在美国和加拿大境内可以继续免费使用谷歌的网上电话服务。Gun-rights advocates in Utah trained 200 teachers in handling concealed weapons free of charge. 尤他州的枪支权利捍卫者为200名老师免费提供了携带和使用隐匿武器的培训。好的，今天我们学习的词是 free of charge, free of charge, free of charge....