我们认为机器必须定期加油。
We consider it necessary that the machine should be oiled regularly.
如果平时出行距离不远，能在家里定期给车充电，那就完全用不着加油了。
If used for short trips and recharged regularly at a household outlet, it would use no gasoline at all.
这些任务包括打开和关闭车门、开动引擎、在红绿灯面前停车，为车加油及进行定期的养护。
Such tasks include opening and closing the garage door, starting the engine, and stopping at traffic lights, in addition to putting oil and gas in the car and performing periodic maintenance.
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