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Sentence

彼かれは技ぎ術じゅつをコツコツと積つみ上あげてきた。

Span Details

技ぎ術じゅつ

technique; skill

noun

steadily; diligently; ploddingly

adverbial manner marker (with adverbs and mimetics)

積つみ上あげ

pile up; heap up; stack; lay (bricks); accumulate; build up; amass

-> 積み上げるichidan verb

action or change coming toward the speaker or up to the present

-> てくるgrammar

past tense or completed action