Well, let's go back to this picture. There's one challenge symbolized at the top, but there's another challenge to science symbolized at the bottom. 好吧，让我们回到这张图片。在其上部有一个符号化了的科学挑战。而在其下部同样有一个符号化了的科学挑战。
联合国教科文组织总干事博科娃在2017年世界环境日上的致辞。（中英对照） Message from Ms. Irina Bokova, Director-General of UNESCO, on the Occasion of World Environment Day 教科文组织总干事伊琳娜·博科娃女士在世界环境日的致辞 Connecting People with Nature 连接人与自然
So here, you're going to see a thousand robots that are working together to self-assemble the letter K. 这里你们可以看到一千个机器人合作自发组成字母K。 The K is on its side. And the important thing is that no one is in char
