常見(jiàn)例句雙語(yǔ)例句Such protection zones shall be divided into first-grade protection zones and protection zones of other grades.生活飲用水地表水源保護(hù)區(qū)分為一級(jí)保護(hù)區(qū)和其他等級(jí)保護(hù)區(qū)。Certain water areas and land-based areas beyond the first-grade protection zones may be delineated as protection zones of other grades.在生活飲用水地表水源一級(jí)保護(hù)區(qū)外，可以劃定一定的水域和陸域?yàn)槠渌燃?jí)保護(hù)區(qū)。A first-grade teacher was having trouble with one of her students.一年級(jí)女教師跟她的一個(gè)學(xué)生較上了勁。權(quán)威例句Now, seven months later, Taylor is beginning to read and does first-grade math.NPR: Students Blossom in the Desert 返回 first-grade