remarkable quickness 显著的敏捷
mental quickness 思维敏捷
with quickness 迅速地
A: I was impressed by his quickness in responding to the email.
A：我对他在回复邮件时的迅速印象深刻。
B: Yes, he is always very efficient at work.
B：是的，他工作一直非常高效。
1) 速度；敏捷
2) 反应迅速
3) 快捷
1. 敏捷，快速
noun
1. The quality of moving or happening very quickly.
Synonym: speed, agility, rapidity