automatically through button circuit

例句：

1. 1. The machine operates automatically without human intervention.
   这台机器无需人工干预就能自动运行。
2. 2. The program is designed to operate automatically when the user leaves the room.
   这个程序设计成在用户离开房间时能自动运行。
3. 3. The car starts and accelerates automatically when the signal is received.
   当接收到信号时，汽车会自动启动并加速。