1、时常出入
... 时常地 most of time ; oftentimes ; everywhen ; Every now and then 时常出入 frequentation ; frequent shun 时常数 time constant ...
2、常往
...frequent 时常发生的frequentation 常往frequentative 表示反复的 ...
3、常访
... frequent = 频繁 frequentation = 常访 frequentative = 表示反复动作 ...