When the appointed time came to blast Yuri Gagarin into orbit, he simply pushed a button that completed the ignition circuit and watched the motors start.

当推送尤里·加加林进入轨道的预定时刻来临之际，他只是简单地按下一个按钮闭合点火电路并看着发动机启动。

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Use relays, contactor, button, air switch and travel switch etc low-voltage constitute control circuit called relay contact control circuit.

使用继电器、接触器、按钮、空气开关、行程开关等低压电器构成的控制电路称为继电接触控制电路。

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Two-channel operation: Redundancy in the input circuit. Earth faults in the Emergency Stop circuit and shorts across the emergency stop push button are also detected.

双通道操作：输入回路中存在冗余重复输入。急停回路中的接地故障及急停按钮相邻成对触点间的短路故障都将被检测。

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Button completed a race simulation at the Circuit de Catalunya on Saturday at the same time as Ferrari driver Felipe Massa.

BBC: Jenson Button says there is more to come from McLaren

"It's been a tough weekend for them (Red Bull) but also we are going to a circuit where they will be very quick, " Button said.

BBC: I must find form, admits Button

Webber, who battled with Button for more than half the race in Valencia, could finish only ninth as the Red Bulls struggled to find any pace on the stop-start street circuit and is now 20.5 points behind Button.

BBC: I must find form, admits Button