And are there any specific design elements that you're particularly proud of, anything that was particularly hard to solve for?

有没有什么特别设计元素让你觉得特别自豪，和让你觉得特别难解决？

You say hello, you small-talk if you see them in the yard, you discuss problems as they arise and you help each other in an emergency.

有子里见到他们就与他们打招，短暂聊天，与他们讨论难解决，需要互相帮助。

" We're making gains in the easy stuff and we're seeing the more difficult stuff, which is the outdoor industrial air pollution and chemical pollution, still going up."

“我们容易解决问题上取得了进展，但我们也看到了更难解决问题，即户外工业空气污染和化学污染，仍加剧。”

" To rack (rack) your brain" means to spend a lot of time thinking about something, especially something that's very difficult – a problem that's very difficult to solve.

“To rack (rack) your brain” 意思是花很多间思考某， 尤其是非常困难——非常难解决问题。

And then we discussed the word thorny. A tree or bush with thorns is difficult to touch and handle and similarly a thorny issue is a subject that is difficult to deal with and discuss.

然后我们讨论了" thorny" 。一个有刺树或者灌木很难触碰，而且相似是，一个棘手问题是很难解决和讨论话题。