以下为句子列表：
英文: 7 How long is it to circulate bottoms up?
中文: 需要循环多长时间？
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英文: A centrifugal pump is used in CIP to convey cleansing liquid into mateial pipe and equipment recipients to force the cleansing liquid to circulate to make cleaning without taking apart pipes or equipment.With the system the equipment availability can be i
中文: CIP利用离心泵输送清洁液在物料管道和设备容器内进行强制循环，达到清洗目的而不需要对管道设备解体，提高设备利用率，减少劳动强度。
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英文: Air-heating systems circulate air through ducts to and from an air heating collector (Figure 1).
中文: 空气加热系统使空气循环，通过通往或是通出空气加热收集器的管道（见图一）。
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英文: All day the sun has shone on the surface of some savage swamp， where the single spruce stands hung with usnea lichens， and small hawks circulate above， and the chickadee lisps amid the evergreens， and the partridge and rabbit skulk beneath； but now a more
中文: 整天，太阳曾照在一些荒野的沼泽表面，孤零零的针枞上长着地衣，小小的鹰在上空盘旋，而黑头山雀在常春藤中蹑嚅而言，松鸡、兔子则在下面躲藏着；可是现在一个更阴郁、更合适的白昼来临了，就有另外一批生物风云际会地醒来，表示了那里的大自然的意义。
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英文: “Good advertising does not just circulate information. It penetrates the public mind with desires and belief.
中文: 好广告不只在传达讯息，它能以信心和希望，穿透大众心灵。
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