英语翻译，高手指点！

您好！

Apart from the number, valence and uniqueness of associations, the study could be further extended by considering another important association property: strength of brand association (Keller 1998).

Associations to do with a brand can be formed and based on several sources (e.g. advertising, word-of-mouth, trial), and some sources are more important than others since they lead to differences in the strength of the association.

翻译为：

除了协会的数字，原子价和独特之外，研究可能是更进一步藉由考虑另外的重要协会财产延长: 商标协会 (Keller 1998) 的力量.

以商标做的协会能被形成而且基于一些来源 ( 举例来说广告，口头的,试验) ，而且因为他们导致协会的力量不同，一些来源比其它重要。