twenty-one-mile的意思|示意

是定语 ... twenty-one-mile 是定语 it 代表to build a platform in the centre of the Channel,做形式主语 serve as 作为...来服务；起...作用 ...

加连字符 的计划 twenty-one-mile 加连字符，用单数，作定语 2、This platform would serve as a port and a railway station. 这座平台将用作码头和火车站.

用单数 European Continent: 欧洲大陆 twenty-one-mile 加连字符, 用单数, 是定语 It 代表: to build a platform in the centre of the channel. 作形式主语 .