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fast，英语单词，主要用作形容词、副词、动词、名词，作形容词时意为“快速的，迅速的；紧的，稳固的”，作副词时意为“迅速地；紧紧地；彻底地”，作动词时意为“禁食，斋戒”，作名词时意为“斋戒；绝 …

Although no form of matter yet discovered moves as fast as or faster than light, scientific experiments have already confirmed that accelerated motion causes a traveler's time to be stretched.

语法 Fast, quick or quickly? Fast and quick mean moving with great speed. Fast is both an adjective and an adverb. Quick is an adjective and the adverb form is quickly. …