句子翻译，谢谢，工作职责描述，短句，马上给分的

1. (谁？)Sustain the high-speed and stable performance of the company's computer network and IT system;
2. The IT department is responsible for and in charge of the computer lab;
3. IT staffs are responsible for the maintenance of any equipment in computer lab;
4. No entry into the computer lab without any permit from the IT department
5. External maintenance personnel or visitor must be registered and enter the lab only under the company of IT staffs

1.Guarantee the company Intranet and information system to run fast ,stably and safely.
2.The computer room be longs to the IT Department and is in the charge of the IT Department .
3.The computer facilites should be maitained by the IT personnels .
4.Nobody is allowed to enter the computer room without the admittance of the IT Department.
5.Maintance personnels outside the IT Department and visitors must be registered and companied by personnels of the IT Department for admittance.

To assure the company's internet web system and information system speedy , stability , safety .