constant的副词形式：constantly；
例句：
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。
扩展资料
Scientists are constantly developing new terminologies.
科学家不断发展新的`专门用语。
The sun is constantly evaporating the earths moisture.
太阳使地球上的湿气不断蒸发。
I was constantly ill, with a baffling array of symptoms.
我不断地生病，还伴有一大堆莫名其妙的症状。
