doodad

1. N-COUNT You can refer to something, especially an electronic device, as a doodad when you do not know exactly what is called. (尤指叫不出名的电子装置)玩意儿[美国英语] [非正式]

Part of the attraction of photography is gadgets and mechanical doodads. 摄影术的吸引力部分在于它那些小装置和机械玩意儿。