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1.a plan for a twenty-one-mile tunnel
1) twenty-one-mile 为形容词, 修饰tunnel
There is a one-hundred-mile bridge between the two islands.
2) a plan for… “…的计划” I like to make plans for my holidays.
2. serve as… 充当,起…的作用 The sofa can serve as (a) bed.
a better plan was put forward
put forward 固定短语 was put forward (被动) Has he put forward any plans for the meeting?
He suggested that a double railway-tunnel should be built.
suggest(建议)后面跟从句时, 从句的谓语动词形式为should(可省略) + 动词原形 He suggested they change the plans.
