In the beginning I had this feeling that it was a secondaryinstrument.
刚入道的时候，我也觉得口琴只是个配角乐器。
2
The literature about primary instrument and secondaryinstrument of the flowmeter is summarized.
随后对该流量计一次仪表和二次仪表方面的研究做了全面介绍。
3
The device is composed of a pressure sensor and a secondaryinstrument. It has been put into use in connection with a computer for data collection and processing.