optional equipment

• 选购的附加设备,附加设备,备选设备

optional equipment的用法和样例：

例句

1. Lack of equipment fully operational needs and equipment capacity should have the best description of the selected device will result in consequences do not match.
   缺乏对设备作业需求的充分说明和设备应该具备的最佳能力的描述，将会导致所选设备不匹配的后果。