Translation of "Frequent" in Chinese

They make frequent trips to Europe.

他們經常去歐洲。

She's a frequent visitor to this country.

她经常来这个国家。

His visits became less frequent as time passed.

他渐渐地不常登门了.

Fiona's letters were becoming less and less frequent.

Fiona的信件越來越少。

The third most frequent letter in Esperanto is "e".

在世界语里，第三最常见的字母是“e".

The use of trust-region algorithms is becoming more and more frequent.

信赖域的算法越来越常用。