苹果产品在实用和时尚之外，更有一股酷劲儿。

Apple products were more than functional and sleek. They were "cool."

youdao

“在实用层面上，它弥补了汉字本身并不表音的缺陷。”他这样说。

"On a level of practicality, it makes up for the fact that Chinese characters do not indicate the sounds themselves," he says.

youdao

不过，对测定目标物距离来说，声波运行的速度太慢，因此，声波回声测距法在实用中有其局限性。

Thus this soundwave echo method has its limitation in practical use.

youdao

Another way to say that it's going to be less, so you don't get confused with that the fact this is in the numerator here, there is that negative sign so it's less energy but it's a bigger negative number that gives us that less energy there.

另一个方式去说它将会变得很低实用，你们不用在这里的计算器的事实感到迷惑,这里有一个负号实用，它是更少的能量,但它是一个更大的数字,这里了它给了我们更少的能量。

麻省理工公开课 - 化学原理课程节选