But nobody knows how, for such zones are scattered, local and often temporary phenomena, and locating them in the wide expanse of the sea is hard.

但没人知道海龟是怎样找到上升流区的，这些区域都是局部性的，非常分散，且常常只是暂时现象，要想在宽广的海洋中找到它们绝非易事。

Vampire lore remained a local phenomenon until the 18th century when Serbia was caught in the struggle between two great powers, the Habsburg Monarchy and Ottoman Empire.

直到 18 世纪塞尔维亚陷入哈布斯堡君主制和奥斯曼帝国这两个大国之间的斗争之前，吸血鬼的传说一直是当地的现象。