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当：应该；益：更加；壮：雄壮。年纪虽老而志气更旺盛，干劲更足。
(1) [hale and hearty in old age; be old but vigorous]∶主要指老年人继续保持旺盛的斗志 丈夫为志,穷当益坚,老当益壮。——《后汉书·马援传》 (2) [florid old; be old in age but buoyant in spirit; there's many a good tune played on an old fiddle]∶年纪虽老,仍健康和充满活力 老当益壮,不甘落后
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