Used as a means of traffic in China,the bike is very useful.1 开头为什么有Used?而不是直接 As a means of traffic in China,the bike is very useful?

Used as a means of traffic in China,the bike is very useful.1 开头为什么有Used?而不是直接 As a means of traffic in China,the bike is very useful?
Used as a means of traffic in China,the bike is very useful.
1 开头为什么有Used?而不是直接 As a means of traffic in China,the bike is very useful?

Used as a means of traffic in China,the bike is very useful.1 开头为什么有Used?而不是直接 As a means of traffic in China,the bike is very useful?
used as a means of traffic in China在这里做状语,说明bike是被当做一门交通工具在使用
而bike与use之间是被动关系,所以用过去分词形式

bike is a kind of traffic tool, not a means.