We invited authors of selected Comments and Perspectives published in Nature Machine Intelligence in the latter half of 2019 and first half of 2020 to describe how their topic has developed, what their thoughts are about the challenges of 2020, and what they look forward to in 2021.

中文翻译：

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2020年的AI思考

我们邀请了2019年下半年和2020年上半年发表在《自然机器智能》上的部分评论和观点的作者来描述他们的话题如何发展，他们对2020年挑战的看法以及他们对2021年的期待。