China is ranked 29th in the English proficiency Index and belongs to the low-proficiency tier.
全球英语熟练度中国排名29位，属于低熟练水平。
The paradigm of task switching was used to examine the effects of cue and preparation in shifting attention. The subjects were 34 high-and low-proficiency junior high school learners of math.
选取34名初中数学优差生为被试，采用任务转换实验考察其注意转换中的线索效应和准备效应。
Many of them have limited English proficiency that can lead to costly mistakes or low productivity.
他们中许多人英语水平有限，这可能导致代价不菲的失误和工作效率低下。
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