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to pass; to elapse; to go by
to pass through; to go through
to experience; to go through; to undergo
長い年月を経て完成しました。
It was completed after many years.
様々な経験を経て人として成長します。
I grew through various experiences.
創業から既に五十年の歳月を経た。
Fifty years have already passed since the founding.