发动机正常工作时，是曲轴带动连杆，进一步带动活塞运动。（ ）
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London, has a population of around 9 million, is a very expensive city to live in.
She is the onemade me feel uncomfortable.
My grandmother,is 86 years old, is coming onholiday with us this year.
My car, isa Mercedes, can reach speeds of 140 km per hour.
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