You can use either two AA batteries or a DC connection for the power supply.
你可以使用两节AA电池或电源为直流连接。
All the costs and expenses involved in or in connection with shall be borne by AA Company.
具体商务工作中所涉及的相关费用，由AA公司自理 。
All the costs and expenses involved in or in connection with shall be borne by AA Company.
具体商务工作中所涉及的相关费用，由AA公司自理 。
应用推荐