频繁的英文：
frequently
often

参考例句：

be socially active
社交频繁

Japan does lots of trade with the United States.
日本与美国间的贸易频繁。

It seems illogical to change the timetable so often.
时间表变动得如此频繁，似乎没有什么道理。

Reforms usually begin with extra indexation and more frequent adjustment of controlled interest rates.
改革往往始于额外指数化，或者更加频繁地调整控制利率。

The hemming method most frequently utilized in the sample room is the plain hem stitch.
样品室使用最频繁的卷边针法是包缝缘边针迹。

The sufferer can experience frequent relapses.
患者可能会频繁发病。

Persistent attacks of coughing
咳嗽的频繁发作

She suffered continual police harassment.
她频繁受到警方的骚扰。

Accidents are happening with increasing frequency.
事故发生得越来越频繁。

Given to frequent changes of mood;temperamental.
易于频繁改变脾气的;喜怒无常的

frequently是什么意思：
adv. 经常地

These faculae frequently are the forerunners of sunspot formation
这些光斑常常是形成太阳黑子的先兆。

To accustom by frequent repetition or prolonged exposure.
使……习惯由于经常重复或长时间接触而适应。

He is a frequent visitor to our house.
他是我们家的常客。

His frequent hesitations annoyed the audience.
他三番五次欲言又止，听众已感到厌烦。

The stud frequently blew himself out
这匹种马常屏住气把胸部胀得鼓鼓的。

often是什么意思：
adv. 时常，常常；往往，通常

They often gossiped.
They often gossiped.

Often the good suffer, and often the wicked prosper.
好人总是受气遭殃，坏人往往青云直上。

She often keeps a diary.
她常记日记。

We often go hunting.
我们常常去打猎。

He often appear as a soloist.
他经常作为独奏者上台演出。