Ever see a street str do something like this?

你见过街头黑帮会这样的吗?

The technique is quick and cheap, and massive STR databases of criminals already exist.

该技术快速、廉价，并且已经存在大量的罪犯 STR 数据库。

We have an STR beginning cluster, strai-- strai-- the T can come out as a CH there.

我们有一个 STR 起始簇，strai-- strai-- T 可以在那里作为 CH 出现。

You may have found words beginning " s-t-r" difficult to pronounce when you're learning English-" str" , " str" , " str" -because it's a combination of sounds.

在学习英语时，您可能发现以“s-t-r”开头的单词很难发音——“str”、“str”、“str”——因为它是发音的组合。

But it has one big limitation: scientists need stretches of DNA no shorter than 100-400 base-pairs long to be sure of capturing any single STR in full.

但它有一个很大的局限性：科学家需要不少于 100-400 个碱基对的 DNA 片段才能确保完整捕获任何单个 STR。

Different people will have a different number of STRs at each site, which allows DNA samples to be matched to their owner simply by measuring the number of repeats.

不同的人在每个部位都会有不同数量的 STR，因此只需测量重复次数即可将 DNA 样本与其主人进行匹配。

If two samples are identical across several sites (a full STR profile usually consists of between 16 and 25 sites), the chances they come from two different people is vanishingly small.

如果两个样本在多个部位完全相同（完整的 STR 谱通常包含 16 到 25 个部位），那么它们来自两个不同人的可能性就微乎其微。

So int is short for integer and that represents a whole number and str is short for string, so here we're subtracting a string from an integer, and Python doesn't know what to do with it.

因此int是整数的缩写，表示整数而str是字符串的缩写，所以这里我们减去一个整数的字符串，Python不知道如何处理它。

So that is where we're calculating the age, and right below that you can see the type of error. In this case, we have a type error, and here's the message. Unsupported operand types for subtraction. Int and str.

这就是我们计算年龄的地方，就在下面你可以看到错误的类型。在这种情况下，我们有一个类型错误，这里是信息。不支持的操作数类型减法。 Int和str。