Declension
01
变格, 名词变格
(in the grammar of some languages) a group of nouns, pronouns, or adjectives changing in the same way to indicate case, number, and gender
例子
Studying the declension patterns of Russian nouns can be challenging for language learners due to the extensive variations in endings.
学习俄语名词的变格模式对语言学习者来说可能具有挑战性，因为词尾的变化非常广泛。
02
下降, 下坡
a downward slope or bend
03
衰退, 退化
process of changing to an inferior state
