Lexical analysis of the main tasks are: to scan source code character by character from left to right, resulting in one word (Token), also check the source of lexical errors.

词法分析的主要任务是：从左到右逐个字符地扫描源程序，产生一个个单词(Token)，同时检查源程序中的词法错误。

youdao

But the silence was unbroken, and the stillness gave no token, And the only word there spoken was the whispered word "Lenore!"

VOA: special.2009.02.02