how to pass a script stored in a parameter to a job?

i used following code, doesn't work. how can pass script block parameter start-job?

 $script="my script...."

 start-job -name test -scriptblock {$script}

  $sb={ myscript }  start-job -name test -scr $sb    

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[string](0..9|%{[char][int](32+("39826578840055658268").substring(($_*2),2))})-replace "\s{1}\b"

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