进行回头料加工一般情况下不进行抽真空，靠自然排气。
Generally speaking, the processing of recovery materials exhausts by nature methods but not vacuum.
经试验表明酵母抽提物能明显改善鸡精调味料风味，提高产品品质。
The experiments show that Yeast extract improves the flavor and quality of chicken granule flavoring remarkably .
酵母抽提物除做调味料外还广泛用于保健食品。
Besides the use as flavor additive, yeast extract is also wildly used in healthy food.
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