陈玉面临的首要困难是：不仅仅要保持语言熟练程度，还要掌握社交礼仪。
For Chen a major difficulty lies not only in maintaining her language proficiency, but also in mastering social etiquette.
实验表明交际策略的类型，应用频率和有效性受语言熟练程度和任务性质的影响。
The results indicate that the type, frequency and effectiveness of communication strategies employed by the learners vary according to their proficiency level and the nature of tasks as well.
“我之前是在这里，”他说着用红色彩笔划出一条水平线，表示他中风时的语言熟练程度。
"I was here," he says, using a red marker to draw a horizontal line indicating his skill level when he had his stroke.
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