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早い， 速い， 疾い， 捷い， はやい
1. fast, quick, rapid, swift, speedy, brisk, prompt
2. early, soon, earlier than usual
3. premature, too soon, too early
4. easy, simple, quick, fast
5. as soon as ..., the moment ..., the instant ...
快、迅速；早，比平时早
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ついていける， 付いて行ける
1. to keep in pace with, to keep up with, to follow (someone's thought), to understand
tbd
