你实际上是在浪费珍贵的资源- - -并不是指浪费金钱，而是指在汽车每行驶3000英里或者你的驾驶时间达到三个月的时候，便去更换机油的行为。专家称，平均来说，大多数的车在行驶了7500英里的时候才有必要更换机油。
It's a waste of a precious mineral - not to mention money - to take your car in every 3,000 miles or three months, experts say.On average, most cars don't need an oil change for 7,500 miles.
研究人员及其他专家称，尽管他们只得到这些答案的部分提示，但大多数还是令人鼓舞的。
The investigators and other experts said they had only partial hints of answers, but most were encouraging.
神经医学专家温德尔称，绝大多数习惯性头痛患者病因都是服用了过多的止痛药。
Neurologist Natalie Wiendels says the vast majority of people who suffer from chronic headaches take too many painkillers.
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