Say “cheese”. Click (咔嚓)! I am Curiosity (好奇号), a Mars rover (火星探测器). I took a selfie with the camera on my robotic arm on Mars. How do I look? In fact, 57 different photos make up this selfie. It records (记录) an important time. For the first time, I drilled (钻) into the surface (表面) of Mars.