• “…investigation of three trimeric aluminum(III)-water species: …”

→ “…investigate the three trimeric aluminum(III)-water species: …”

EXPLANATION: limited/exact number = “the”; unlimited = not necessary

说明：可数名词之前需要用“the”；不可数名词不一定必需

• “…properties of triangular Al₃ structure are…”

→ “…the properties of the triangular Al₃ structure are…”

EXPLANATION: 1) with “X of X”, “the” is required in most cases. 2) “the” is used with things already mentioned in the text (Al₃)

说明：1、使用“X of X”形式， “the” 多数情况下是必须的2、“the” 用于指文中已经提及的事情，比如Al3

• “…according to “Core-link” model or “Cage-like” Keggin-Al₁₃ model.”

→ “…according to the “Core-link” model or the “Cage-like” Keggin-Al₁₃ model.”

EXPLANATION: use “the” in front of the names of unique models/methods, etc.

说明：在特定的方程式、方法等的名称之前用“the”

1.[写作指导]科学写作：摘要撰写及常见错误（六） 
2.[写作指导]科学写作：摘要撰写及常见错误（五） 
3.[写作指导]科学写作：摘要撰写及常见错误（四） 
4.[投稿指南]科学写作：摘要撰写及常见错误（二） 
5.[投稿指南]科学写作：摘要撰写及常见错误（三） 
6.[写作指导]科学写作：摘要撰写及常见错误（一）