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US Timekeeping Stations Might Go Silent
2018-09-10来源:和谐英语
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shut – v. to close
accurate – adj. free from mistakes or errors
transmit – v. to send in the form of electrical signals to a radio, television or computer
permeates – v. to pass or spread through something
frequency – n. the number of times a sound or radio wave is repeated in a period of time
appliance – n. a machine that is powered by electricity and that is used in people's houses to perform a certain job
irrigation – n. describing a system to supply water using man-made means (for agriculture)
standard – n. a fixed official unit of measurement
propagation – n. the act of causing to spread out
tune – v. to change and improve the sound of a musical instrument
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