We left Heidelberg before sunset. I noticed one thing during the road to our next station. I found many 'wind power station'(风力发电站). These kinda device were not just seen after we left Heidelberg, i saw them all the time when we were driving along the expressway. From this, i can understand a little why Europe has such a nice environment. In fact, i didn't find ANY man-made pollution during the trip. In my eyes it's just like the ppl there 'belong to the nature', while we, Chinese, 'are against the nature'
coz in China i see man-made pollutions all the time.