Get the car serviced before he changes the oil.
趁他做汽车保养之前把机油换好。
The effect of load changes, the distribution of the constant flow of the hydraulic oil.
该阀不受负载变化的影响，分配流量恒定的液压油。
Chemical changes have made a great many plants into coal, oil, and gas.
化学变化使得大量植物变成煤、石油和煤气。
My mechanic changes the oil twice a year.
修理工半年给换一次油。
My mechanic changes the oil twice a year.
修理工半年给换一次油。
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