It is hard to track the blue whale, the ocean's largest creature, which has almost been killed off by commercial whaling and is now listed as an endangered species.
作为海洋中最大的生物，蓝鲸很难追踪，但由于商业捕鲸，它们几乎灭绝，现在已被列为濒危物种。
Biologists were delighted early this year when, with the help of the Navy, they were able to track a particular blue whale for 43 days, monitoring its sounds.
今年早些时候，当生物学家们在海军的帮助下，成功追踪到一只特定的蓝鲸长达43天并监测它的声音的时候，生物学家们很高兴。
Satellite maps reveal the track of the recent Hurricane Earl as a wide swath of cool blue water from the Caribbean up the East Coast of the U.S..
卫星地图显示了最近一场飓风“厄尔”的运行路径：一条宽阔的蓝色带状水域，从加勒比海向北延伸到美国东海岸。
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