translation.en: One of these four different shapes is actually a rotated version of this shape. I want you to tell me which one: the first one, second one, third one or fourth one?
translation.zh: 这四个中的一个是由这个形状旋转得到的。 我希望你们能告诉我是哪一个。 第一个，第二个，第三个还是第四个？