第三及录音: The biggest question I have is why systems like these become more popular in other countries trying to switch to renewable energy? What is confusing is that while China has found a way to have an affordable price for these units and make them commonplace in China, it’s very rare to see a unit like this in America. I know we are now picking up on tankless water heaters, but it’s still a mystery as to why these units haven’t become more popular. Or is it? 我最大的疑问是,为什么在向可再生能源转型的其他国家里,这些装置日趋流行?令人费解的是,中国设法使这些装置的价格让人们承受得起,使这些装置在中国普及,而在美国却难得见到一例。我知道我们现在又在重提即热式热水器这个话题,但是为什么这些装置至今没有普及仍然是个谜。是这样的吗?