在as……as和more……than等比较结构中，as/then可作连词，引导比较状语从句，充当从句中的主语、表语、宾语的作用，其功能类似于定语从句的关系代词。如：
Children should not have more money than is needed.孩子们不应该有比需要的更多的钱。
The medicine is more effective than is expected.这药比预期的更有效。
She makes as much (money) as I do.她赚的钱和我赚的一样多。
倍数表达法
”A is 倍数+the size/length/width of B“
A是B的几倍大小/长/宽
”A is 倍数 as +形容词或副词原级+as B“
A是B的几倍
“A is 倍数 more than B”
A比B多几倍
The Yangtze River is almost three times the length of (=three times as long as =twice longer than) the Pearl River.长江差不多是珠江的三倍长/长江差不多比珠江长两倍。
