gear down

• • (齿轮、车辆等)减速，换成低速挡：

    He geared the car down.

    他把汽车换成慢挡。

  • 降低，减弱：

    The courses have been geared down to the lower ability of students in there special classes.

    课程降低了要求，以适应这些特殊班能力较低的学生。