The scanner is sometimes called a lexical analyzer.是什么意思？

The scanner is sometimes called a lexical analyzer.

扫描程序有时又把它称为词法分析程序.

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

scanner

n. 扫描器，扫描设备，检测装置，细查者；

例句
The scanner will save risk and pain for patients...
扫描仪将使病人免遭风险和痛苦。

is

vt.& vi. 是（be的三单形式；n. 存在；

例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。

sometimes

adv. 有时，间或，时

例句
I want to work at home on a Tuesday but as it turns out sometimes it's a Wednesday or a Thursday.
我想周二在家工作，但实际上有时却是周三或是周四。

called

v. 叫( call的过去式和过去分词 )，通电话，认为，估计；

例句
He has also called for an acceleration of political reforms.
他同时呼吁加快政治改革的步伐。

lexical

adj. 词汇的，具词典性质的，词典的；

例句
We chose a few of the commonest lexical items in the languages.
我们选取了各语言中最常见的几个词汇。

analyzer

n. 分析者，分析器，吸收器；

例句
The syntax analyzer calls the scanner when it needs a new symbol.
当语法分析程序需要新符号时,它就调用扫描过程.