Over the past 20 years, says the report, forest cover has grown by 5.7%, or around 40,000 sq km, an area roughly the size of Switzerland.
请问老师an area,the size...是不是都是forest cover的同位语?
an area...是around 40,000 sq km的同位语,解释说明around 40,000 sq km(单纯的数字比较抽象)大概是多大的样子(比较形象)。
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