up down traverse of the arm

圆形升降喇叭... ... 圆形 a circle;a circular form;a round shape 臂部升降 up-down traverse of the arm 海陆升降 bradyseism ...

t z T... ... 二进制可逆计数器 binary counter 手臂升降 up-down traverse of the arm 手臂俯仰 up-down turning of the arm ...