opportunist

n. 机会主义者,投机者

There were many opportunists and few men of principle.

机会主义者多, 坚持原则的人绝无仅有.

One who conforms to the prevailing ways and opinions of one's time or condition for personal advantage; an opportunist.

随波逐流的人为了个人好处而认同自己所处时期或状况中流行的方式或观念的人；机会主义者