英语的改写句子Traveling by piane is more expensive than traveling b

英语的改写句子Traveling by piane is more expensive than traveling by train.（保持句意不
Traveling by piane is more expensive than traveling by train.（保持句意不变）
Traveling by train is —— —— —— traveling by plane.
—— more expensive —— ——by plane than traveling by train.

Traveling by plane is more expensive than traveling by train.（保持句意不变）
=Traveling by train is 【less expensive than】traveling by plane.
=【It is 】more expensive 【to travel 】by plane than traveling by train.

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