Deep at night a breeze rustles the leaves, which makes the room feel quieter - like 'the bird's cry deepening the mountain's hush.'
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history
From 王籍's 《入若耶溪》 (Liang dynasty, 6th c.): 蝉噪林逾静,鸟鸣山更幽 (the cicadas' racket makes the forest yet quieter; the bird's cry makes the mountain more secluded). One of the most celebrated paradox-couplets in Chinese poetry, praised across dynasties and endlessly imitated. Cited as a textbook example of 以动衬静 (using motion to foreground stillness).
usage
Inseparable from 蝉噪林逾静 - the two lines are exact parallel structures expressing the same paradox. 幽 (yōu) = deep, secluded, hushed. 更 = even more. A staple example in Chinese aesthetics and rhetoric courses.