桨: oar, paddle...
弱势: vulnerable, weak...
方圆: perimeter, range, (within) a radius of......
陆续: in turn, successively, one after the other, bit by bit...
退休: to retire, retirement (from work)...
居民: resident, inhabitant...
着手: to put one's hand to it, to start out on a task, to set out...
