请修正The extraction workshop has a solvent storage tank of about 4 tons which is refilled every time it is used up and the consumption of 4 tons will be recorded According to Mr Tian the production work

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The extraction workshop has a solvent storage tank with a capacity of approximately 4 tons. The tank is refilled each time it is emptied, and the amount of solvent consumed is recorded. According to Mr. Tian, the production workshop manager, under normal production conditions, one tank of solvent is typically consumed in about four days. However, currently, one tank of solvent is being consumed in just one day.