In narrative, the reporting verb is in the past tense.
在叙述程中, 间接引语的动词通常用去式。
Having suffered grievously from biological weapons attacks in the past, China supports work that helps comprehensively to strengthen the effectiveness of the convention. It has actively participated in the work of drawing up a Protocol of the Ad Hoc Group of States Parties to the BWC established in 1994, and has made contributions to the progress of the negotiations on the Protocol.
中国在历史上也曾深受生物武器之害。中国支持全面加强《禁止生物武器约》有效性的工作,积极参加了于1994年设立的约缔约国特设工作组有关制定《约》议定书的工作,并议定书的谈判取得进展作出了贡献。
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