名词
中文翻译：前置标记
同义词：
['anteposition', 'prefix', 'preposition']
例句：
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1. The sentence structure is a crucial element in English grammar.
句子结构是英语语法的关键要素。
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2. In mathematics, the use of symbols like '+' and '-' is essential for solving problems.
在数学中，使用如'+'和'-'这样的符号对于解决问题至关重要。
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3. The word "preface" means to introduce something before it is discussed or presented.
“前言”意味着在讨论或呈现之前引入某物。