all the mobile phone must be kept off,这句话中的keep off怎么翻译keep off有关机的意思吗?我查了一下好像没有啊

英语作文The Mobile phone Mobile phone The Nokia N95 mobile phone is more expensive than the Nokia N73 mobile phone.(同一句转换)The Nokia N73 mobile phone costs_____ _____the Nokia N95 mobile phone. 应是on the mobile phone还是in the mobile phone Download and install the driver for your mobile phone Your mobile phone is missing a driver. The mobile phone on the sofa yesterday evening什么意思. mobile phone为什么叫mobile phone Your mobile phone is on the desk.Where is ________? It is next the mobile phone.错在哪? How to use the mobile phone 的英语作文 I think I d() my mobile phone during the concert the mobile phone and our life英语作文 The mobile phone is mine改为一般疑问句 To(.)surprise ,it was the lastst mobile phone应该是什么 Bring the mobile phone to school tomorrow.改为否定句 Where's ( )mobile phone?A.a B.an C.the My mobile phone is between the book 有什么错误 a model mobile phone of the boy翻译成中文