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）。
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。
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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