dull joke的用法和樣例：
例句
- His joke provided some comic relief in what was really a dull speech.
他說(shuō)的笑話(huà)給極沉悶的講話(huà)增加幾分輕松氣氛。 - Many people are shy to tell a joke, because they have once told dreary jokes, or they are afraid of showing their stupidness ,or hurting others.
很多人羞于講笑話(huà)，因為他們曾經(jīng)講過(guò)一個(gè)讓人感覺(jué)沉悶的笑話(huà)，或者是他們害怕表現出自己的愚蠢，或是怕講笑話(huà)傷害到別人。
