which live on floating objects in the open ocean. 生活在海上的漂浮物体上

291. and less familiar residents.
     不被人熟知的居民
292. We're looking for a tiny creature called a Columbus crab,
     我们在寻找一种叫哥伦布蟹的小生命
293. which is only about the size of your thumbnail,
     只有拇指指甲大小
294. which live on floating objects in the open ocean.
     生活在海上的漂浮物体上
295. Columbus crabs were once only found on natural debris,
     哥伦布蟹曾经只能在天然漂浮物上发现
296. like driftwood or seaweed,
     比如浮木或者海藻上
297. but the oceans are changing,
     但海洋一直在变化

来自《行星地球 第三季 第二集 Planet Earth S03E02 海洋》第 294 行