declension
n. 词尾变化;变格;倾斜;衰退
例句
An ardent outset may be followed by declension.
热情的开端可能继之以冷漠。
I could not take the declension of the sun at noon today, again due to overcast.
由于多云天气再次出现,今天我没法儿从观测中午太阳倾角来判定方位。
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。