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persuade [pɚˋswed ]
v. to cause sb to do sth by arguing or reasoning with him 說服；勸說
v. to cause sb to believe sth; to convince sb 使相信；使信服

【考題】
convince（v. 使確信）

【例句】
He is easily persuaded.
他這人好說話。

How can we persuade him into joining us?
怎麼才能說服他參加我們的活動呢？

We worked hard to persuade them that we were genuinely interested in the project.
我們想盡辦法讓他們相信，我們確實對這個計劃感興趣。

【字源】
< per-：through 從頭到尾 > + < -suad：sweet > → 從頭到尾，嘴要和糖一樣甜 → 才能勸服別人 → 使信服。

【衍生】dissuade（v. 勸阻）→ 嘴巴不甜 → 不說好聽話 → 勸阻。