命题: proposition (logic, math.), to assign an essay topic...
楼梯: stair, staircase...
碎: to break down, to break into pieces, fragmentary...
倒霉: to have bad luck, to be out of luck...
内行: expert, adept, experienced, an expert, a professional...
粗糙: crude, gruff, rough, coarse...
关闭: to close, to shut...
完: to finish, to be over, whole, complete, entire...
失望: disappointed, to lose hope, to despair...
桌子: table, desk...
