第一种方法是同义词法, 即给出一个与 要释义的词在意义上几乎相同的, 如用face表示 countenance, 用nervousness表示 anxiety.
The first method is to give a synonym, a word that has nearly the same meaning as the word you wish to define: face for countenance, nervousness for anxiety.
释义未知；用途未知；如何计算，未知；联邦监管机构认为其意义何在，未知。
Definition unknown; purpose unknown; how it's calculated, unknown; what federal regulators think it means, unknown.
介绍研究背景、意义，并对相关概念进行释义。
It describes research background, meaning, and interpretation of the relevant concepts.
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