例句與造句

1. Clean air act amendment ( 1987 ) established a national air - quality standard for ozone
   1987年潔凈空氣法修正案建立了空氣的國家空氣質(zhì)量標(biāo)準(zhǔn)。
2. Clean air act amendment ( 1977 ) established new deadlines for cleaning up polluted areas ; also required review of existing air - quality standards
   1977年潔凈空氣法修正案確定了清理被污染區(qū)域的新期限，同時(shí)要求對現(xiàn)行空氣質(zhì)量標(biāo)準(zhǔn)進(jìn)行評估。
3. It's difficult to find clean air act amendment in a sentence. 用clean air act amendment造句挺難的