to make sth continue at the same level, standard, etc. 维持；保持◆We will maintain prices at their current level for another six months. 我们将把目前的价格水平再维持六个月。
to keep a building, a machine, etc. in good condition by checking or repairing it regularly 维修；保养◆The equipment has been poorly maintained. 设备没有得到妥善保养。
to keep records and add new information when necessary 记载◆The company maintains a record of all enquiries made. 这家公司对所有的查询都有记录。➡update