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an opportunist
opportunist 是可数名词，单数前用 an，本句用作动词宾语。
The leadership rewarded an opportunist with a senior position.
领导层把一个机会主义者提拔到了高级职位。
机会主义者；投机取巧者
先理解核心含义，再看它在真实句子里的用法。
机会主义者；投机取巧者
a person who places expediency above principle
The leadership rewarded an opportunist with a senior position.
领导层把一个机会主义者提拔到了高级职位。
利用任何机会提升自身处境、将权宜之计置于原则之上的人
Someone who takes advantage of any opportunity to advance their own situation, placing expediency above principle.
将权宜之计置于原则之上的人
a person who places expediency above principle
He is an opportunist who only helps others when there is something to gain.
他是个机会主义者，只在对自己有利的时候才帮助别人。
The manager called the new employee an opportunist for taking credit for a teammate's idea.
经理把这个新员工叫作投机取巧者，因为他把队友的想法归功于自己。
Don't be an opportunist; think about what is fair for everyone.
不要做投机取巧的人，多想想怎样对大家才公平。
opportunist 是可数名词，单数前用 an，本句用作动词宾语。
The leadership rewarded an opportunist with a senior position.
领导层把一个机会主义者提拔到了高级职位。
be an opportunist 作表语，用来描述人的品性或行为方式，常含贬义。
She is an opportunist and will never take a principled stand.
她是个机会主义者，绝不会采取有原则的立场。
定冠词 the 加单数名词可表示典型的一类人，即‘机会主义者这类人’。
The opportunist sees every crisis as a chance.
机会主义者把每次危机都看作机会。
Not this
He is very opportunist.
Use this
He is very opportunistic.
opportunist 是名词，意为“机会主义者”；在系动词 be 后作表语描述性格时需用形容词 opportunistic，不能用名词。
Not this
He is opportunist.
Use this
He is an opportunist.
opportunist 是可数名词且为单数，在“He is + 名词”结构中必须加不定冠词 an，表示“一个机会主义者”。中文没有冠词，容易漏掉。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
政治投机分子
He was accused of being a political opportunist.
他被指责为政治投机分子。
不讲原则的机会主义者
The film portrays him as an unprincipled opportunist who betrays his allies.
这部电影把他描绘成一个背叛盟友、不讲原则的机会主义者。
无耻的投机分子
Only a shameless opportunist would take credit for the work of others.
只有无耻的投机分子才会把别人的功劳揽到自己身上。
彻头彻尾的投机分子
The election campaign revealed him as a rank opportunist.
竞选活动暴露了他是个彻头彻尾的投机分子。
纯粹的投机分子
She saw him as a mere opportunist, not a genuine reformer.
她认为他不过是纯粹的投机分子，并非真正的改革者。
机会主义者是发现自己掉进坑里时就会停止挖掘的人。
He is often called an opportunist because he changes his views whenever it is convenient.
他常被称作机会主义者，因为只要方便，他就会改变自己的观点。
Use opportunist naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
opportunity（机会）＋-ist（人）＝一有机会就上的人，即机会主义者。
语域：neutral 常见场景：political commentary、workplace discussions、everyday conversation 该词通常为中性语域，正式或日常场合均可使用；多含贬义，表示只顾自身利益而不讲原则的人。
这些词虽然拼写都以 -ist 结尾，但都不与 opportunist（/ˌɑpɝˈtunɪst/）押韵。opportunist 的重音在第二个音节的 /tuː/，后面是 /nɪst/；这些词的 -ist 只是词尾非重读的 /ɪst/，重音和元音都不同。特别注意 artist /ˈɑːrtɪst/、tourist /ˈtʊrɪst/ 是典型的“形似音异”词，不能按 opportunist 的拼读方式类推。
Dictionary facts from ECDICT, WIKTIONARY.