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 increase of sterility rate was the direct factor causing yield loss.

空壳率的上升是造成产量损失的直接因素；

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The increase of sterility rate was the direct factor causing yield loss.

空壳率的上升是造成产量损失的直接因素；

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