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我们参加了1989年6月25日至6月30日在美国宾州大学(Penn State University)召开的第十九届双年度碳会议。现将十九届双年度碳会议简介如下:
We participated in the 19th Biennial Carbon Conference held at Penn State University from June 25 to June 30, 1989. The nineteenth biennial carbon meeting is as follows: