tracker
/ˈtrækə(r)/noun
1
- a person who tracks someone or something by following their trail追踪者, 跟踪者。
1.1
- a device that follows and records the movements of someone or something跟踪仪：
electronic trackers are now showing ornithologists where the birds go.
电子跟踪仪现在能告诉鸟类学家鸟的去向。
2
- Finance an investment fund which aims to follow in value a stock market index or group of indexes【财政】追踪基金。
2.1
- a mortgage or savings product whose interest rate aims to follow a particular public interest rate挂钩利率抵押（或储蓄）。
3
- a connecting rod in the mechanism of an organ管风琴的连杆。