translation.en: That's a mussel you can find in the waters out here, and the threads holding it to a rock are timed; at exactly two years, they begin to dissolve.
translation.zh: 在这一带水域里你会看到淡菜。 这些将它们固定在石头上的足丝线是有时效的，不多不少正好两年， 时间到了就开始分解。