The author introduces and comments on the schema theory and double code theory, probes into enlightenment of the two theories on reading teaching to foreign language.

作者对图式理论和双重代码理论作了一些粗浅介绍与评述，探讨了这两种理论对外语阅读教学的启示。

youdao

The ZZ will be a single of double character country code.

FORBES: How Do I Correctly Identify My iPhone So I Can Sell It?

The HIV retrovirus, in particular, is a single-stranded RNA virus that duplicates itself in a host cell by converting its genetic code into double-stranded DNA that is then inserted into the host cell.

FORBES: Progress in Drug Therapy Marks the 25th Anniversary of World AIDS Day

The way we're going to create jobs here is not just to change our tax code, but also to double our exports.

WHITEHOUSE: The White House