1·Blue whales are animals.
蓝鲸是动物。
2·Blue whales are in danger.
蓝鲸正处于危险之中。
3·Blue whales are the largest animals in the world.
蓝鲸是世界上最大的动物。
4·Blue whales are amazing not only because of their huge size, but their slow heartbeat.
蓝鲸的惊人之处不仅在于它们巨大的体型，还在于其缓慢的心跳。
5·By slowing their heart rate, blue whales can send more blood to the muscles that they use to dive.
通过降低它们的心率，蓝鲸可以向用于潜水的肌肉输送更多的血液。
6·They found that when blue whales dive for food, their heart rates are as slow as 2 beats per minute.
他们发现，当蓝鲸潜入水中寻找食物，它们的心率慢至每分钟2次。
7·That's the weight of 15,000 blue whales, the largest animal on Earth.
那相当于一万五千头蓝鲸的重量，而蓝鲸是地球上最大的动物。
8·The Blue whales are the largest animals ever survived on earth.
蓝鲸是地球上生存过的最大的动物。
9·Blue whales are bigger, which we thought would make the lesson more impressive.
蓝鲸更大，我们认为这样说会使人影响更为深刻。
10·The number of Blue Whales has fallen to about 5000 or less, perhaps only 2000.
蓝鲸的数量已经下降到大约5000或更少，也许只有2000。