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.

有时在院子里见到他们就与他们打招呼，短暂聊天，与他们讨论难解决的事情，需要时互相帮助。

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" thorny" 。一个有刺的树或者灌木很难触碰，而且相似的，一个棘手的很难解决和讨论的话。

" 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."

“我们在容易解决的上进展，但我们也看到更难解决的，即户外工业空气污染和化学污染，仍在加剧。”

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

有没有什么特别的设计元素让你觉特别自豪，和让你觉特别难解决的？

It has been an extraordinarily difficult thing to fix.

这一件极其难解决的事情。

Yes, this is not a hard problem to solve.

的，这并不一个难解决的。

But I think that's going to be a very, very difficult solution.

但我想那将一个非常非常难的解决方案。

" To have your work cut out for you" means to be required to complete something that is going to be very difficult;you have a very difficult task, a very difficult problem to solve.

“有忙” 意味着你需要完成一项非常困难的任务； 你有一个非常难解决的。

Google said it would improve its smartphone cameras handling of black and brown skin, But in language, the solutions are less obvious even among people who agree on the problem

谷歌表示会改进其智能手机相机对黑皮肤和棕色皮肤的处理，但在语言方面，即使对达成一致的人也很难找到明确的解决方案。

" 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.

“绞尽脑汁” 意味着花很多时间思考某件事， 特别非常难解决的。

That's obviously the harder nut to crack, but I think it actually helps inform how we think about safety more more broadly.

这显然更难解决的，但我觉它实际上有助于我们更全面地思考安全。

I think it's a really hard problem to solve, but whoever solves the humanoid robot problem are gonna have to solve the social robotics problem.

我认为这一个非常难解决的，但无论谁解决人形机器人， 都必将解决社交机器人。

And it actually is really, really great and has lots of really hard problems.

而且它实际上真的非常棒，有很多非常难解决的。

Is there something you could speak to, what was very hard to solve, and what are some beautiful aspects about the solution?

有没有什么非常难解决的，以及解决方案中有哪些美妙之处？