And actually, a question that might come up, I just explained, the sodium channel, you might say, well, how do potassium channels work then, because I can understand how you can filter something big out, but how do you filter out something small.

实际上，可能大家会问一个问题，我刚解释过，钠离子通道，你可以说，好吧，那么钾离子通道该如何起作用呢，因为我可以理解你是如何把大东西过滤掉的，但是你如何把小东西过滤掉呢？

麻省理工公开课 - 化学原理课程节选

When you say, "How can I," it might mean simply, "How can you do something?"

当你说，“How can I”，这可能是非常简单地表示，“我怎么样才能做到呢？”

How can I 课堂 - SpeakingMax英语口语达人

And the engineering part of that is sort of the part that I talked about in one slide, when I talked about how do you convert this scientific advance into something that can be delivered all over the world.

这其中的工程部分就是,我曾经在一个幻灯片中讲过的,在我讲到,如何将先进的科学技术成果转化为,可以在世界范围传播的东西

耶鲁公开课 - 生物医学工程探索课程节选

In other words, "How can I" might mean, "I can't do something."

也就是说， "How can I"可能是指“我没法做这事。”

How can I 课堂 - SpeakingMax英语口语达人