Scientists want to learn all they can about polar bears and how they can help them.
科学家们想要了解关于北极熊的一切,以及如何才能帮助它们。
When we see lions and polar bears, we marvel at how well these animals have adapted themselves to the savannah and the polar ice caps.
当我们看到狮子和北极熊,我们会惊叹于这些生物怎么能这么好的适应热带草原和极地冰盖。
And, of course, we know also how to set up these integrals in polar coordinates.
当然,我们也知道,怎样用极坐标来计算这些积分。
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