dropping gear 是什么意思

	1.	You remember the first time we dropped gears in this one 还记得我们第一次开这个车的情景吗？
	2.	The ramp shift test on one heavy truck with amt was done , and the test results showed that by dropping gear continuously or discontinuously , the proper gear could be found eventually when the vehicle was running on ramp , though the original gear might be improper 试验结果表明，车辆在坡道行驶过程中，虽然初次选择的挡位不一定能适应该坡道，但通过连续降挡或跳跃式降挡最终总能选择适合于该坡道的挡位。

dropping gear是什么意思