n.语尾变化；格变化；倾斜；衰退
In Latin, the nominative case of first declension nouns ends in a'. 在拉丁文中，属於第一类词形变化的名词的主格以a结尾。
Declension means varying the forms of nouns, pronouns and adjectives in a sentence. 变格是指名词、代词和形容词在句中的形式变化。
