反应

She is slow/swift to respond.

How are they reacting/responding to the crisis?

The older one is, the less sharp one becomes. / Our reactions get slower as we get older.

athlete with great/swift reflexes

test sb's reflexes

We were alarmed at the way he reacted to the drug.

Nerves respond to a stimulus.

positive/neutral/negative reaction

allergic reaction

reflex response

alkaline/acid reaction

reaction period

course of reaction

increase the reaction rate

take part in a reaction

His immediate reaction was one of revulsion.

Her cries for help met with little/poor response.

He glanced over at her for a reaction.

official response

lukewarm response

respond warmly/favourably/generously (to)

overreact/overrespond (to)

reactions vary; receive mixed reactions

give/make a response