關鍵字彙：
accelerate/ decelerate/ expedite/ gallop/ sluggish/ spiraling/ synchronize/ tempo/ velocity
1. 指行進中之車輛等的「高速度」用velocity，動作、生活、工作等的「步調」叫tempo：
•The car came round the corner at such a velocity that the driver was unable to keep it on the road.
•Some hawks descend with terrific velocity on their prey.
•My grandma has not been quite used to the busy tempo of city life.
•The booming economy increased sales and production tempo.
2. 「加速」叫accelerate，「減速」叫decelerate：
•The driver accelerated his car to leave the group of beggars behind.
•To accelerate the improvement of his skill, the pianist practiced four hours a day in the last five years.
•We decelerated (the engine) long before we came to a stop.
•Decelerate a little when you drive by the elementary school.
3. 正式用法中，「加速」安排、計畫等的進展用expedite。另外，（馬等的）「 奔馳」用gallop：
•The builders promised to expedite the repairs to the roof.
•Your timely help will expedite the matter.
•The horse galloped down the hill.
4. 「逐漸加速的」、「節節上升的」叫spiraling，「遲緩的」可用sluggish：
•There is no victory for any country in a spiraling arms race.
•Most families were troubled by the spiraling prices of vegetables.
•Why don't you change this sluggish car engine?
•A man of sluggish mind shows little interest in anything.
5. 「同步」叫synchronize：
•They synchronized their steps/ Their steps synchronized.
•To achieve the desired result, we had better synchronize our acts of protest.
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