Transportation Price 基本例句 运输价格 Space transportation is expensive and risky at present because all launchers so far have used large throwaway components that are based on ballistic missile technology.迄今,由于所有运载火箭都采用以弹道导弹技术为基础的大型一次性元件,所以,目前航天运输价格昂贵且风险大。