I've always had an interest in China.

我一直就对中国感兴趣的。

2.a total of 总计；总数为
 

The project which began in 2007 is supposed to cost a total of 8,000,000,000 dollars.

该项目始于2007年，预计总造价为80亿美元。

3.as well as 和...一样；不但...而且
 

Flowers are chosen for their scent as well as their look.

花儿不仅凭外观也凭香味而被选中。