及物动词

不及物动词

名词

1. changing location rapidly

Synonym: speedinghurrying

2. a central nervous system stimulant that increases energy and decreases appetite
used to treat narcolepsy and some forms of depression

Synonym: amphetaminepep pillupper

3. a rate (usually rapid) at which something happens

e.g. the project advanced with gratifying speed

Synonym: swiftnessfastness

4. the ratio of the focal length to the diameter of a (camera) lens system

Synonym: focal ratiof numberstop number

5. distance travelled per unit time

Synonym: velocity