沉闷的英文：
(adj) (used in reference to weather) oppressive; heavy
(adj) depressed; not happy

参考例句：

a ponderous speech.
沉闷的演讲

A tedious lecture
沉闷的讲演

Real life was gloomy and strenuous.
真实的生活又沉闷又紧张。

Her smile is a breath of fresh air in this gloomy office.
她的微笑给沉闷的办公室带来生气.

They will brighten the dreary lives of Cubans.
他们将照亮古巴人沉闷的生活。

They stigmatize these propositions as "stifling"
他们贬称这些命题"沉闷"。

She poked fun at Alec because he was shy and stodgy
她开亚历克的玩笑，因为他羞怯，同时还有些沉闷。

The earthen floor, beaten hard by countless feet, deadens the sounds; of footsteps.
泥土路面被无数的人踩踏得板板实实，使人们走路的脚步声也变得沉闷。

It was a close, musty, ill-ventilated place, as might be expected, since its inmate seldom left it.
那是一间沉闷、有霉味、通风不良的房子，这也是不足为怪的，因为住在里面人很少出去。

A dreary rain was falling as Celia's taxi stopped at a dingy six-storey building on Thirty-seventh street
令人沉闷的细雨中，西莉亚坐的出租车在第三十七号街的一座破旧和肮脏的六层楼前停住了。

adj是什么意思：
abbr.
1.adjacent 相邻的，邻近的
2.adjectival 形容词的
3.adjective 形容词
4.adjoining 毗邻的
5.adjutant 副官，人事行政参谋
abbr.

bittersweet adj.
又苦又甜的；苦乐参半的

collateral adj.
并行的；附随的；旁系的

] colorful adj.
华美的；富有色彩的；有趣的

used是什么意思：
adj. 用过的，旧的；习惯于…的

It is used as a reflexive.
它被作为反身代词使用。

That was a balk to us.
那对我们是个挫折。

They help us to be maximal encouraging to us.
他们来帮助我们对我们是个极大的鼓舞。

reference是什么意思：
n. 提到，谈及；参考，查阅；证明人，介绍信
v. 查阅；参考；给（书）等附参考资料

The headmaster supplied him with a reference.
校长给他提供证明人。

You can refer to a dictionary if necessary.
如果有必要，你可以参考字典。

No referring back to books and notes!
不准看书和笔记！