No trouble to walk around." Aldrin appeared on the ladder.

VOA: special.2009.07.15

It's a ladder used to ascend a tree, it's a kind of tool of ascent that's a kind of a tool for getting fruit.

这是用来爬上树的梯子，是一种上升的工具,也是用来摘果子的。

耶鲁公开课 - 现代诗歌课程节选

It's a twisted ladder and there's a couple of things to notice about this familiar structure.

它犹如扭曲的梯子,对于这众所周知的结构有几件事必须注意

耶鲁公开课 - 生物医学工程探索课程节选

There's the ladder to heaven in "After Apple-Picking."

在“摘完苹果“中有通向天堂的梯子“

耶鲁公开课 - 现代诗歌课程节选

As early as 1826 an important pro-slavery writer named Edward Brown argued that "Slavery," he said, quote: "Had ever been the stepping ladder by which nations have passed from barbarism to civilization."

早在1826年,一位重要的亲奴主义作家,爱德华·布朗说过,"奴隶制,曾是帮助那些国家从野蛮时期,发展到文明社会的阶梯"

耶鲁公开课 - 美国内战与重建课程节选

The consolation is they're killing people at the top too so they're going to so when you do get a job in a financial institution there will be more spaces above you on the ladder to move up.

慰藉就是，他们同样也在高层解雇人,所以他们将会,当你在一家金融机构找到工作后,你会有很大的晋升空间。

耶鲁公开课 - 金融市场课程节选

The corresponding half of the ladder that corresponds to any given ladder, let's say the black DNA molecule that corresponds to the blue one is not just a mirror image.

与任何单链配对的,另一条单链,比方说与蓝色DNA分子,配对的黑色DNA分子,并不是蓝色DNA分子的镜像

耶鲁公开课 - 生物医学工程探索课程节选

That's because you have to satisfy this base pair matching in order to have hydrogen bonding in each of the struts of the ladder in order to form a stable structure.

NA双链要满足互补配对原则,以使碱基对之间,形成氢键,从而形成稳定的双链结构

耶鲁公开课 - 生物医学工程探索课程节选