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短语(必须用课文原句)
Traveling ________(以一个……的速度)over 400 kilometers per hour, the train can complete the 30-kilometre journey in eight minutes．
答案：at a speed of
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短语(必须用课文原句)
Traveling ________(以一个……的速度)over 400 kilometers per hour, the train can complete the 30-kilometre journey in eight minutes．