Supererogation
n. 职责以外的工作
🗣️ 情景例句
He'll do anything to avoid getting down to math lessons,
他老是设法想逃避数学，
Fortune favours fools.
傻子有傻福。
as the wave leaves the particles behind back to its starting point again.
当波浪把微粒留在身后时又回到出发点。