Associations

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association [简明英汉词典]
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n.协会,联合,结交,联想,社团,
Chemistry Any of various processes of bination,such as hydration,solvation,or plex-ion formation,depending on relatively weak chemical bonding.
【化学】 缔合：靠相对弱的化学束缚而产生的化合过程的一种,如水合、融合或结合
Ecology A large number of organisms in a specific geographic area constituting a munity with one or two dominant species.
【生态学】 群丛,结合体：在一特定地理区域里由一种或两种主要种类构成的区域的大量有机体
======以下答案可供参考======
供参考答案1:
联盟,协会供参考答案2:
协会供参考答案3:
联盟,协会,社团,合伙