He compares real estate prices to the crest of a wave that keeps rising; when it reaches its peak it will naturally stop and adjust. When it gets to the nadir, it will begin moving up to another peak.
他比喻地產價格是條不斷上升的波動曲線，漲到高峰自然停下來調適、盤整；待跌到谷底，又會往另一個高峰攀升。