Of all the factors proved to affect foreign language attrition, only the direct effects of affective factors are uncertain.
在已探明的外语磨蚀影响因素中，只有情感因素对外语磨蚀的直接作用尚不明确。
Of all the factors proved to affect foreign language attrition, only the direct effects of affective factors are uncertain.
在已探明的外语磨蚀影响因素中，只有情感因素对外语磨蚀的直接作用尚不明确。
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