To the surprise of the little boy, the door opened automatically as he approached.
令小男孩吃惊的是，在他走近时门自动打开了。
The swing door will resile automatically after it has been opened.
弹簧门被打开后可以自动弹回。
I forgot that our alarm automatically turns on at 11 PM, so when people opened the door, it went off.
我忘了我家的报警器每天晚上11点会开，有人开门它就响了。
The anti-theft mobile phone alarm can be installed on a door needing theft protection, the alarm is automatically given off if the door is vibrated or is opened, thereby preventing the property loss.
将防盗手机报警器装在所需防盗的门上，门被振动或被打开时就可实现自动报警，防止了财物的损失。
The hydraulic damper can close the door automatically by means of torque energy stored when the door is opened.
它可以利用开门时蓄存的扭矩能量，自动将门关闭。
The hydraulic damper can close the door automatically by means of torque energy stored when the door is opened.
它可以利用开门时蓄存的扭矩能量，自动将门关闭。
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