gear down
1．change into a lower gear in order to lose speed使汽车换慢档；使车辆减速
Going down a steep grade，the driver geared down the car．下陡坡时，司机放慢了速度。
The driver geared down as he came into the corner．司机拐弯时换了慢档。
2．reduce in force or intensity减弱；降低
The courses have been geared downto the lower ability of students in the special classes．对水平较低的特殊班级的学生，已经降低了一些课程的要求。
The dosage was geared down to a level which would work on the infected cells but not upset their normal metabolism．药量减到了一定程度，既能对受感染的细胞起作用，又不影响正常的新陈代谢。
able for安排（调节）以适应
Education should be geared to the children's needs and abilities，教育应与孩子们的需要和能力相适应。