busy oneself in

使忙于，使忙碌

business, business address, business card, business hours, business studies, businesslike, businessman, busing, busk, busker, busking, busman, bust, bust-up, bustard, buster, bustle, bustling, busty, busy, busybody, but, but for, butane, butch, butcher, butcher's shop, butchery, butler, butt, butter, butter-bean, butter-fingers, buttercup, butterfly, buttermilk, butterscotch, buttery, buttock, button,