Under the poet's pen, the mountains and wilds brimmed with life.
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盎然 is a literary/written-language word. It almost never appears alone and always follows a noun: 春意盎然 (full of spring vitality), 生机盎然 (teeming with life), 兴致盎然 (full of enthusiasm), 诗意盎然 (full of poetic charm).
memory
盎 is a wide-mouthed earthen pot overflowing — 盎然 pictures abundance overflowing its container.
