Diamond rings can dull over time, yet with a little bit of toothpaste and a good rinse, they'll be sparkling away in no time.

随着时间的推移，钻戒会失去光泽。但是，用一点牙膏，好好地冲洗一下，它们立马又闪闪发光了。

youdao

I'm familiar with the problem the RS describes: when I was at secondary school over a decade ago, our computing classes were terribly dull.

我清楚皇家学会关心的问题：十年前，当我还在上中学时，我们的计算机课就非常的枯燥。

youdao

On May 20th UniCredit said that it would take over Capitalia, an Italian bank whose predecessor, Banco di Roma, was once as flashy as Credito Italiano was dull.

五月二十日，联合信贷表示他们将并购前身是罗马银行的Capitalia。 曾几何时，Capitalia有多么的光鲜亮丽,意大利信贷就有多么的沉闷乏味。

youdao

I saw it clearly -- all a dull blue, with a horrible veil over it that chilled my bones;

VOA: special.2009.05.16

One day before China's big moment, the Olympic opening ceremonies, a dull haze hung over Beijing.

NPR: Beijing Preps For Opening Of Olympics

According to USA Today's Claudia Puig, the "obnoxious, over the top and often dull" result constitutes "a feeble attempt to rehash action-hero glories".

BBC: Die Hard sequel leaves critics cold

The Pontipee brothers, after all, are trapped in a dull, generic plot when they're not leaping over sawhorses, whereas there's a knowing awareness of form to Dr. Frank-N-Furter's gyrations that goes way beyond mere choreography.

NPR: The Greatest Musicals? 'Singin' in the Rain' Tops List