constant的副词形式
constantly adv. 不断地；时常地；
Surgical techniques are constantly being refined.
外科手术技术正在不断得到完善。
The direction of the wind is constantly changing.
风的方向在不断地变。
He constantly feels he has to prove himself to others.
他时常觉得自己必须向人一展身手。
Reporters constantly badger her about her private life.
记者经常纠缠着打听她的私生活。
Scientists are constantly developing new terminologies.
科学家不断发展新的专门用语。