let someone down fail to support or help someone as they had hoped or expected （在某人希望得到帮助时）不予理会。 ■ (let someone/thing down) have a detrimental effect on the overall quality or success of someone or something 使功亏一篑, 影响大局： the whole machine is let down by the tacky keyboard. 整个机器就被这个破键盘给搞坏了。 |