1. danci.911cha.com

1. A parallelepiped bounded by six similar faces (either rhombuses or parallelograms).
    有六个面的平行四面体（或是棱形的或是平行四边形的）。

2. In the mid1970s, Penrose came up with a set of just two rhombuses that did the job.
    二十世纪七十年代中期，彭罗斯得出答案，仅用两块菱形瓷砖作为一套就可以做到这一点。