Competition is a vital factor to affect tree growth.

竞争是影响树木生长的重要因素。

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Motivation is a direct factor to affect foreign language learning.

动机是影响外语学习效果的最直接因素。

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The variation of age structure is an important factor to affect the economy.

人口年龄结构的变动是影响经济的重要因素。

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Accelerator goes beyond just location to factor in the browser, OS and other criteria that could affect a data packet's journey.

ENGADGET: Box Accelerator may triple cloud upload speeds versus its rivals, comes to syncing apps soon (video)

In addition to the obvious economic advantages, one important factor that may positively affect the growth of unmanned missions is the looming shortage of traditional airplane pilots.

FORBES: The Drones are Coming. The Drones are Coming.