you know that for every sequence of a nucleic acid

你们知道每个核酸序列
there's a complimentary sequence.

都有互补序列
Now of the two complimentary sequences,

这两段互补序列
one of them encodes the gene.

其中一段是编码基因的
One of them has the right sequence of codons

该段带有正确的密码子序列
to specify the amino acid sequence of the protein,

能够指导氨基酸序列合成蛋白质
and the other one has a complimentary sequence.

另一段则是它的互补序列
You know from our discussion last time that

从我们上次的讨论中可以得知
these two complimentary strands are not mirror images of one another,

这两段互补序列并非互为镜像
they're not identical, they're complimentary.

它们并非相同而是互补的
They face in the opposite direction

它们是反向的
and you could predict the properties of one

尽管你能够通过一条链上的碱基序列