1．mother language/tongue 母语
2．language barriers 语言障碍
3．native speakers 说本族语的人
4．an official language 官方语言
5．Englishspeaking countries 说英语的国家
6．be perfect in 精通
7．languageacquiring ability 语言学习能力
8．enlarge/expand one's vocabulary 扩大词汇量
9．have a large vocabulary 词汇量很大
10．master a foreign language 掌握一门外语
11．have a grasp of 掌握
12．acquire skills/knowledge 获得技能/知识
13．learn ．．．by heart 用心记住……
14．refer to/consult a dictionary 查字典
15．be exposed to 接触……
16．take full advantage of 充分利用
17．come across/meet with trouble/difficulty 遇到困难
