tachograph
noun [ C ] uk/ˈtæk.ə.ɡrɑːf/ /ˈtæk.ə.ɡræf/ us/ˈtæk.ə.ɡræf/
速度记录器;里程表;转速计
a machine inside a vehicle such as a truck that records speed, distance travelled, and stopping periods, used to control the driver's legal hours of work
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