Professor Morford says signers are like English learners whose first language uses a different alphabet.

VOA: special.2011.04.13

They're sort of second-language learners struggling along.

他们艰难的学习着第二语言

耶鲁公开课 - 心理学导论课程节选

A lot of them are actually English-as-a-Second-Language learners, but for Spanish, so.

他们本身是西班牙人，英语是他们的第二语言。

教英语 - SpeakingMax英语口语达人