The species and the number of Ectomycorrhizal fungi (ECM fungi) are influenced by many environmental factors, such as soil factor, climate and season, and site factor.

土壤、气候和立地因子等环境因子影响树木外生菌根菌的种类及数量。

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There is no simple or single factor that determines if a given site will be a savanna, but some factors seem to play important roles in their formation.

没有什么简单或单一的因素能决定一个给定的地点是否会成为热带草原，但部分因素似乎在热带草原的形成中扮演着重要的角色。

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When probable manipulation is detected, a spam rank factor is applied to a site, depending upon the type and severity of the infraction.

当检测到有可能暗中操纵时，将视违规的类型和严重性给予一个网站一个垃圾等级系数。

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The Company firmly believes that its Web site is a key factor behind its industry leading comparable store sales gains.

FORBES: Barnes & Noble Should Start Thinking Outside of the Big Box

In regards to rankings, in 2010 Google began using site speed as a ranking factor in their search algorithm.

FORBES: Ecommerce Marketing Checklist for 2013

But what if I were to tell you that the most important factor is how a site makes a visitor feel?

FORBES: Why Does 'Emotional Design' Work on the Web: for Felony & Mayhem, It's No Mystery