プログレッシブ和英中辞典(第4版)の解説
まんねん【万年】
&fRoman1;〔１万年〕ten thousand years
&fRoman2;〔多くの年月，永久〕
彼は万年助教授で終わりそうだ
He'll be an associate professor forever.／He'll never be promoted to professor.
万年床
a permanently unmade bed
彼はいつも万年床だ
He never bothers to put away his bedding during the day.
万年塀
a concrete- slab wall
万年雪
perpetual [eternal] snow