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as much as one can; as much as possible; if at all possible
できるだけ静かしずかにしてください。
Please be as quiet as possible.
できるだけ早くはやく仕事しごとを終わらおわらせます。
I'll hurry as much as I can.
できるだけたくさん食べたべました。
I ate as much as I could.