Zhang's "constant review" is simply having the teacher review previously covered material at regular intervals, perhaps every week, every month, shortly after the beginning of term, or before tests, to establish it firmly in students 'memories.
「反覆循環」的觀念就是讓老師隔段時間，如每週、每月、開學不久、考試前，幫學生複習學過的內容，把訊息儲存在記憶中。