our national transportation policy.

　　我們國家的交通運輸政策

　　The group was considered to be a risk to national security.

　　這伙人被認為是威脅國家安全的`危險分子。

　　Class sizes in the school are below the national average.

　　這所學校班上的人數少于全國平均數。

　　He's a talented athlete who competes nationally and internationally.

　　他是一位有才華的運動員，既參加國內比賽，也參加國際比賽。

　　The programme was broadcast nationally.

　　這個節目曾在全國播放過。

　　The president's popularity nationally is at an all-time low

　　總統在全國的人氣目前正處于歷史最低點。