This is a frequent occurrence.

这是经常出现的情况。

Fowl Pox was a frequent occurrence in poultry at that time.

鸡痘是一种经常发生在家禽那个时候。

This is an era filled with frequent occurrence of emergencies.

这是一个突发事件频发的时代。

For kids like me, being called childish can be a frequent occurrence.

因为孩子喜欢我，让人说我孩子气是常发生的事。

That quarrels and divisions were of frequent occurrence can't be doubted.

那种抱怨和区分无疑是经常的事件。