translation.en: A few years ago we took a 3D printer and we made coral choice surveys -- different colors and different textures, and we simply asked the coral where they preferred to settle.
translation.zh: 在几年以前，我们用3D打印设备， 进行了珊瑚选择鉴定研究， 给出不同颜色和材质的环境， 我们简单地观察珊瑚虫， 想知道哪些环境是它们最喜欢的。