Be able to read and write in only one language while to listen and speak in the other.
使用一种语言来读和写；而用另一种语言来听，说。
我读的时候，请写下来。
While John is read a history book, Mary is write her maths exercises.
当约翰在看一本历史书时，玛丽在做数学练习。
While John is read a history book, Mary is write her maths exercises.
当约翰在看一本历史书时，玛丽在做数学练习。
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