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alternately; in succession
「更」 has other readings with different meanings.
寒さと暑さが更に訪れる季節の変わり目。
The changing of seasons where cold and heat come alternately.
涙と笑顔が更に溢れる卒業式だった。
It was a graduation ceremony overflowing with alternating tears and smiles.
雨と晴れが更に繰り返す不安定な天気だ。
The weather is unstable with rain and sun alternating.