如果你要翻译得好，必须精通两种语言。
If you wish to translate well, you must know both languages well.
具有双语能力的失聪儿童常见么，对于他们来说要精通两种语言的最大障碍是什么？
How common is bilingualism among the deaf community, and what are the biggest barriers for deaf children to obtain proficiency in two languages?
移民的孩子往往会说两种语言，而且精通英语，“到了第三代，大多数移民家庭都丧失了原来的语言。”
The children of immigrants tend to be bilingual and proficient in English, "by the third generation, the original language is lost in the majority of immigrant families".
爱子会说英语和日语两种语言，精通数学，所以还能为李特朗处理账目。
She can speak English and Japanese and is so accomplished at mathematics she can do Mr Trung's accounts.
本人因工作需要，需精通英语、日语两种语言。
Cause of the job, I need to be proficient in English and Japanese.
要精通两种不同的语言是困难的。
要精通两种不同的语言是困难的。
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