A clean, dry sample is weighed and then evacuated for several hours in a vacuum chamber, flushing with CO2 to remove remaining air if necessary.

将岩心样品洗净烘干并称重，然后把样品放到真空箱中抽空其内的空气（必要时充入CO2驱替掉空气）。

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The chamber was evacuated but not before the event was captured on television.

会议厅人员被疏散时，电视就报道了此事。

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