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一気に， いっきに

1. in one go, in one gulp, in one breath, without stopping, without pausing, without a rest, in one sitting, at a stretch 2. suddenly, all of a sudden, all at once

连续不断，一口气；突然

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降り積もる， ふりつもる

1. to fall and pile up (e.g. snow), to lie thick

降雪、积雪

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