短语词组用作形容詞 (adj.)～+名詞frequent caller 常客frequent changes 經常變換frequent feature 常見的特征frequent visitor 常客副詞+～less frequent 不是很頻繁very frequent 很頻繁alarmingly frequent 驚人地頻繁annoyingly frequent 多得令人心煩relatively frequent 較爲頻繁～+介詞frequent for 頻繁地做…短語 返回 frequented