Adobe can take a long time to dry and become hard.

VOA: special.2009.01.12

They evolve to become very dense, hard, pustular lesions, which are filled with what turns out to be tissue debris.

它们逐渐变成粘稠,发硬,产生脓包状的伤痕,而这些粘稠的脓事实上是组织残骸

耶鲁公开课 - 生物医学工程探索课程节选

And I can be that standing in my own faith because really what you become is an example, a model of an engaged faithful person who is now working so hard to bring people different religion traditions together."

我能坚持自己的信仰,因为你成为的那个人是,一个有信仰的人，他正在致力于,使不同的宗教传统融合“

普林斯顿公开课 - 人性课程节选

He wanted to show how three very different artists worked hard to become experts in their art.

VOA: special.2009.08.07

Because people do all sorts of behaviors which become very, very hard to interpret if they don't really believe their bodies are going to die.

因为人们有各种行为,如果他们不相信自己的肉体会消亡,这些行为将非常难以诠释。

耶鲁公开课 - 死亡课程节选

They told the story of a poor farm boy who educated himself and, through hard work and honesty, had become a candidate for president.

VOA: special.2009.07.09

The poet Wallace Stevens puts it beautifully when he says that poetry should make the visible a little hard to see; in other words it should be a defamiliarizing of that which has become too familiar.

诗人华莱士，史蒂文斯在解释这点时说得很漂亮,他说，诗应给能见之物涂上一点朦胧的色彩，换句话说,诗应将熟悉的事物陌生化。

耶鲁公开课 - 文学理论导论课程节选

After years of hard work, Hank Williams had become a star.

VOA: special.2009.11.22

Take me out to the park, etc... " It's amazing that that melody has become as popular as it has given the fact that it's really hard to sing.

带我出去逛公园,等等,奇怪的是,这段旋律,很流行,而事实上,它真的很难唱

耶鲁公开课 - 聆听音乐课程节选

It's one of the most rapidly changing, hard to keep up with areas because someone can set up an electronic exchange overnight and suddenly become a base for trading trillions of dollars of securities.

经纪业是一个变化最快的行业之一,人们很难跟上它的步伐,因为人们可以在头一天晚上,设置一个电子交易,一夜之间,他就能在证券市场赚到千亿美金

耶鲁公开课 - 金融市场课程节选

I can only imagine though, at this point in the semester, what will become Milton's eventual championing of marriage is pretty hard to imagine, in part because we're just devoting our second class to a literary work given almost entirely to the virtue of chastity.

然而我只能认为，在学期的这个时候，什么将成为弥尔顿婚姻的最终捍卫者,一定难以想象，一部分是因为,我们的第二节课一直在讨论,关于贞洁的美德的作品。

耶鲁公开课 - 弥尔顿课程节选

In fact, even if you haven't had a biology class it's hard to be alive in 2008 and not know something about DNA; it's become such an important part of our lives.

实际上,即使你们没有上过生物课,也不可能活在当下却对DNA一无所知,它已经与我们的生活密不可分

耶鲁公开课 - 生物医学工程探索课程节选