1
decreasing + noun
作前置定语，修饰名词，表示该事物在逐渐减少。
The company reported a decreasing profit margin.
公司报告了不断下降的利润率。
减少的；下降的
先理解核心含义，再看它在真实句子里的用法。
减少的；下降的
On the decrease; becoming less.
The company reported a decreasing profit margin.
公司报告了不断下降的利润率。
正在减少的。
On the decrease.
The decreasing temperature indicates that winter is coming.
不断下降的温度表明冬天即将来临。
The company is facing decreasing profits due to the economic downturn.
由于经济低迷，公司正面临利润下降的问题。
We noticed a decreasing trend in the number of visitors to the museum.
我们注意到博物馆参观人数有下降的趋势。
作前置定语，修饰名词，表示该事物在逐渐减少。
The company reported a decreasing profit margin.
公司报告了不断下降的利润率。
固定搭配，表示按从大到小或从高到低的顺序排列。
The books are arranged in decreasing order of height.
这些书按高度从高到低排列。
Not this
The decrease number of job opportunities is a serious problem.
Use this
The decreasing number of job opportunities is a serious problem.
这里误把动词/名词 decrease 当作形容词放在名词前。表示“正在减少的”应该用现在分词形容词 decreasing 来修饰 number，而 decrease 没有形容词用法。
Not this
The decreased number of students every year worries the principal.
Use this
The decreasing number of students every year worries the principal.
这里要表达“每年都在减少的学生人数”，是持续变化的过程，应该用现在分词 decreasing；decreased 只表示“已经减少了”的完成状态，与“每年”所表示的持续过程矛盾。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
下降趋势
The report highlights a decreasing trend in unemployment.
报告强调了失业率下降的趋势。
数量减少
A decreasing number of people are using cash.
使用现金的人越来越少了。
下降率
The country saw a decreasing rate of inflation.
该国的通货膨胀率呈下降趋势。
重要性下降
The decreasing importance of physical media is changing the industry.
实体媒体重要性的降低正在改变这个行业。
人口减少
Many rural villages face a decreasing population.
许多农村村庄面临人口减少的问题。
收益递减
The company hit decreasing returns after expanding too quickly.
公司扩张过快后，收益出现递减。
Use decreasing naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把decreasing看成de+creasing，想象一条线被向下一折（crease折痕），数值跟着往下走，就是“减少的”；与increasing相反。
语域：neutral 常见场景：统计与趋势描述、学术或正式报告 decreasing 作形容词时表示“减少的、下降的”，多用于书面或较正式的表达，比如报告、学术文章或数据趋势描述；在口语中也可使用，但整体语气略正式。
decreasing, increasing, leasing, ceasing, and releasing all end in /iːsɪŋ/ and rhyme: /dɪˈkriːsɪŋ/, /ɪnˈkriːsɪŋ/, /ˈliːsɪŋ/, /ˈsiːsɪŋ/, /rɪˈliːsɪŋ/. The shared spelling chunk is -easing. Be careful: pleasing has the same -easing spelling but is pronounced /ˈpliːzɪŋ/ (ending /iːzɪŋ/), so it does not rhyme.
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.