剑桥词典 doorstep noun [C] (STEP) a step in front of an outside door （门前的）台阶 He left the package on the doorstep. 他把包裹留在了门前的台阶上。 doorstep noun [C] (BREAD) UK a very thick piece of bread 厚面包片 习语on sb's doorstep 返回 doorstep