Translation of "Challenges" in Chinese

I'm captivated by the challenges of translation.

翻译的挑战让我着迷。

- But I will always be honest with you about the challenges we face. I will listen to you, especially when we disagree. And above all, I will ask you to join in the work of remaking this nation, the only way it's been done in America for 221 years; block by block, brick by brick, calloused hand by calloused hand.
- But I will always be honest with you about the challenges we face. I will listen to you, especially when we disagree. And above all, I will ask you to join in the work of remaking this nation, the only way it's been done in the United States for 221 years; block by block, brick by brick, calloused hand by calloused hand.

但我将总是会向你们坦陈我们所面临的挑战。我会听取你们的意见，尤其是存在不同意见的时候。最重要的是，我会请求你们参与重建这个国家，以美国221年来从未改变的唯一方式-一砖一瓦、同心协力。

And I know you didn't do this just to win an election. And I know you didn't do it for me. You did it because you understand the enormity of the task that lies ahead. For even as we celebrate tonight, we know the challenges that tomorrow will bring are the greatest of our lifetime: two wars, a planet in peril, the worst financial crisis in a century.

我知道你们的所做的一切并不只是为了赢得选举，我也知道你们做这一切并不是为了我。你们这样做是因为你们明白前面的任务有多么艰巨。即便我们今晚欢呼庆祝，我们也知道明天将面临我们一生之中最艰难的挑战——两场战争、一个面临危险的星球，一个世纪以来最严重的金融危机。