For others, however, perhaps a steady current that we can both comfortably paddle through and  comfortably float in is more than enough.

然而，对于其他人来说，也许一条稳定的水流，让我们既能舒适地划过，又能舒适地漂浮其中，就足够了。

A special challenge was the design of an electronic device that can turn the constantly changing wind speed, and therefore varying power, into a steady electric current.

而对于电子设备亟待解决的一个难题是这样的设计可以把不断变化的风速及风速变化的功率，转变成稳定的电流。