seasonable: implies appropriateness to the season or being perfectly fitted to the occasion or situation: ~ weather. （appropriate合适implies eminent and distinctive fitness十分合适，如a golf bag what was an appropriate birthday gift for a golfer对于高尔夫爱好者，送高尔夫球包作生日礼物十分合适） 又如seasonable temperatures/clothes/moment合时令的气温/衣服/适当的时机 occasion时间时机time or situation
timely: applies to what occurs or appears at the time or moment when it is most useful or valuable: a ~ warning. 又如timely arrival/reminder/rain/snow及时赶到/提醒/雨/瑞雪
well-timed: applies to what is so timely as to suggest care, forethought, or design: a ~ remark that stifled objections. 如he built the company through a string of well-timed acquisitions通过一系列时机恰到好处的并购，他建立了这家公司，如本例恰到时机的一句话
opportune: describes something that comes, often by chance, at the best possible moment and works to the advantage of those concerned: an idea that arose from an ~ remark. 又如he couldn't have arrived at a less opportune moment他当时来得太不是时候了，如the opportune use of humour to lower tension适时运用幽默来缓和紧张气氛
pat: may apply to what is notably apt, ready, or well-suited to the occasion: a ~ remark; OR to what is so very apt as to be suspect: offered an alibi that seemed too ~. apt贴切，指语言精确得体，如a speech laced with some apt quotations演讲中包含了贴切的引用
seasonable合时令: 指合适的时间时机，timely及时: 表示在最有用处价值的时间出现，well-timed时间恰好: 指十分及时，以致让人想到事先精心计划，opportune时间恰好: 表示时间最有利最有利于成功，pat时间恰好: 表示时间时机十分恰好，或表示到了不自然不可信的地步
记忆方法: 1）首字母STWOP想成W我 + STOP停止<==适时停止
2）适时的意思是在时间时机合适mean peculiarly appropriate to the time or situation. situation情况，"合适的"情况即时机
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