Please infuse with pencil powder (oil free) into key-hole then running few times when door open is not flexible.

门锁开启不灵活时，可以往钥匙孔内加入适量的铅笔芯粉末再往来转动几次即可。切勿随便滴注机油。

youdao

Please infuse with pencil powder (oil free) into key-hole then running few times when door open is not flexible.

门锁开启不灵活时，可以往钥匙孔内加入适量的铅笔芯粉末再往来转动几次即可。切勿随便滴注机油。

youdao