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ten-four
01
了解（りょうかい）, はい
a radio code used in two-way radio communication as an affirmative response or an indication of understanding
Example
The dispatcher acknowledged the officer 's request with a simple " ten-four " over the radio.
" Ten-four, I copy that, " replied the firefighter to confirm receiving instructions from command.
The truck driver radioed in a " ten-four " to indicate he understood the new route given by dispatch.
