My room door is locked on the inside, so I need your spare key to open it.
2
我的房门被反锁了，需要你的备份钥匙来开门。
My room door is locked, I need your help to open it. (correct?) is it locked up also can?
3
电池用途：本品主要适用于手表、计算器、电子词典、汽车电子钥匙、微型广播、医用设备、备份支撑电源。
Application: watches (digital and analog), calculator, electronic notebook, electronic keys for automobile, card radio, medical equipment, memory backup power source.
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