The 1976 copy right act has not prevented these abuses fully, but it has clarified the legal rights of the injured parties and given them an avenue for remedy.
出自-2014年6月听力原文
What has prevented the passing of work-family balance laws in the United States?
出自-2010年6月阅读原文
Many cancer cases could be prevented.
出自-2010年12月听力原文