如图，△A₁B₁C₁是边长为1的等边三角形，A₂为等边△A₁B₁C₁的中心，连接A₂B₁并延长到点B₂，使A₂B₁=B₁B₂，以A₂B₂为边作等边△A₂B₂C₂，A₃为等边

△A₂B₂C₂的中心，连接A₃B₂并延长到点B₃，使A₃B₂=B₂B₃，以A₃B₃为边作等边△A₃B₃C₃，依次作下去得到等边△A_nB_nC_n，则等边△A₅B₅C₅的边长为____．

    Hello, boys and girls. Welcome to this place. This is a f____ station. It's big. We can see some fire engines. They are r____. How many fire engines? Let me count. One, two, three…Ten are new, a ____two are old. The man is a f____. He's Jill's father. He's Mr Black. He's a t ____man. He likes helping people. He likes his job.