资料来源 : WordNet®

each year
     adv 1: without missing a year; "they travel to China annually"
            [syn: {annually}, {yearly}, {every year}]
     2: by the year; every year (usually with reference to a sum of
        money paid or received); "he earned $100,000 per annum";
        "we issue six volumes per annum" [syn: {per annum}, {p.a.},
         {per year}, {annually}]