propone 是 postpone 吧。prolong vt. 拖延；延长。及物动词。例：They prolonged their visit by two days. 他们延长访问二天。postpone vt. 使…延期；把…放在次要地位；把…放在后面。也是及物动词，但通常以被动语态出现，例：The match was postponed to the next day because of bad weather.比赛因天气不好而延期到第二天进行。
还可以作为不及物动词使用 vi. 延缓，延迟；延缓发作
