but no one really knows 不过真正原因无从知晓

50. No, the display of a file clam.
    当然不是,这是火蛤蜊在表演
51. Perhaps this extraordinary pulsation of the clam's fleshy mantle
    蛤的肉质外壳的这种非常特别的规律性闪电
52. is a warning to frighten away nibbling fish,
    是在警告咬它的小鱼?
53. but no one really knows
    不过真正原因无从知晓
54. And there are snakes here, too, lots of them.
    这里也有蛇 许多的蛇
55. These are banded sea crates.
    这是巨环海蛇
56. They lay their eggs on land but they hunt here in the water.
    它们在陆地上产卵,在水里捕食

来自《行星地球 第一季 第九集 Planet Earth S01E09 海洋》第 53 行