旋流器内的旋转流场中存在一内边界,其速度头为零;
There is an inner boundary within the rotational flow field of hydrocyclone.
那就是你,一个人类,以及一头灰熊,它正在以惊人的速度向你奔来。
Those would be you, a human, and a grizzly bear, the thing that's approaching you alarmingly fast.
座头鲸以每小时1.6公里的速度从阿拉斯加游到夏威夷。
Humpback whales swim at a speed of 1.6 kilometers an hour from Alaska to Hawaii.
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