Xīn chéngyuánguó de jiārù jiāng zēngqiáng zǔzhī yǐngxiǎnglì.
The new member state's accession will strengthen the organization's influence.
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Standard multilateral-diplomacy term: 联合国成员国 (Liánhéguó chéngyuánguó, UN member state), 欧盟成员国 (Ōuméng chéngyuánguó, EU member state). Built from 成员 (member) + 国 (country).