a strip of wood or other rigid material used for measuring length or marking straight lines; a ruler.
动词
1
exercise ultimate power or authority over (an area and its people).
the region today is ruled by elected politicians
同义词：
governpreside overcontrolhave control ofbe in control ofleadbe the leader ofdominaterunheaddirectadministermanageregulatebe in powerbe in controlhold swaybe in authoritybe in commandbe in chargegovernbe at the helmreignsit on the thronewear the crownwield the scepterbe monarchbe sovereignliterary：sway
2
pronounce authoritatively and legally to be the case.
a federal court ruled that he was unfairly dismissed from his job
同义词：
decreeorderdirectpronouncemake a judgmentjudgeadjudgeadjudicatelay downordaindecidefinddetermineresolvesettleestablishholdrare：asseverate
3
make parallel lines across (paper).
rule the pages horizontally and print the information within the rules.
