剩余辐射

residual radiation

to remain / to be left / to have as remainder

remainder / surplus

surname Yu

(archaic) I / me / variant of 餘|余[yu2], surplus

extra / surplus / remaining / remainder after division / (following numerical value) or more / in excess of (some number) / residue (math.) / after / I / me

radiation

spoke of a wheel

old variant of 射[she4]

to shoot / to launch / to allude to / radio- (chemistry)