ESL stands for English as a Second Language.
（ ESL 意指以英語為第二語言）
ESL means that the students you would be teaching speak a language other than English--English as a Second Language. You would need some rudimentary knowledge of their native language to be able to effectively teach them English.
（ESL意謂著您所要教的學生們操著有別於英語的語言- 以英語為第二語言，教其英語者，需要一些該地學生的基本母語知識，以便有效的英語教學）
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