Nine days after take-off, Voyager landed smoothly at Edwards Air Force Base in California.

VOA: special.2010.10.06

What's hanging off of the side of this long molecule that's formed by polymerizing nucleotides are - is this base unit.

在这条由多聚核苷酸,构成的长链分子,一侧悬挂着碱基单位

耶鲁公开课 - 生物医学工程探索课程节选

The 5' carbon has a phosphate off of it and that phosphate is linked to the 3' carbon of the next one and they all have a base hanging off the side.

'碳的磷酸基,连接到下一个戊糖的3'碳部位,它们都有连接在一侧的碱基

耶鲁公开课 - 生物医学工程探索课程节选

Ball says adults should start off with exercises at the base of the pyramid, like walking or climbing stairs.

VOA: standard.2010.02.26

Now DNA is a double helix and I've only shown you one part of the helix, right? I've shown you one upright strut and a base hanging off of it, but it forms a double helix because complementary strands of DNA strongly associate with one another and that's a very stable structure.

NA是双螺旋,我只是给你们讲了螺旋的一边,我给你们演示,一条链的支柱及碱基团,但其能构成双螺旋,是因为DNA是完全互补的两条链,彼此之间结合紧密,结构异常稳定

耶鲁公开课 - 生物医学工程探索课程节选