The old man climbed a ladder, picked a peach and handed it to his wife.

VOA: special.2009.02.28

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

This represents the upright struts on a ladder that I showed you before, it represents this backbone that's shown by - that's formed by polymerizing the pentose's together through phosphate's always going 5' to 3', 5' to 3'.

线条代表梯子,上下的支柱 之前给你们演示过,代表由多聚戊糖分子,通过磷酸基从5'端向3'端方向,连接起来的主链

耶鲁公开课 - 生物医学工程探索课程节选

And they found a ladder that had been moved from its place.

VOA: special.2009.08.01

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 backbone's on the outside of the molecule like the upright struts of a ladder on the outside of a ladder.

主链位于DNA分子结构外侧,像梯子两侧上下的支柱,记住是梯子外侧

耶鲁公开课 - 生物医学工程探索课程节选

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

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