are gathering in unprecedented numbers. 正以前所未有的数量聚集

48. This shark won't need to eat for another few days.
    这条大白鲨几天内都不用进食了
49. But he's not alone.
    然而大白鲨可不止一条
50. These usually solitary hunters
    这些往往独自行动的狩猎者
51. are gathering in unprecedented numbers.
    正以前所未有的数量聚集
52. A dozen at a time.
    一次十几条
53. The seals are nimble...
    海豹虽然很灵活
54. ..but great whites are patient...
    但大白鲨十分有耐心

来自《行星地球 第三季 第一集 Planet Earth S03E01 海岸》第 51 行