余热

residual heat / surplus heat / fig. old people's capacity for work

residual heat; surplus heat; waste heat / (fig.) capacity of retirees to continue to work

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

to warm up / to heat up / hot (of weather) / heat / fervent