网友回答：用物主语比较符合英美国家的习惯，The tubes he been cut into 1m per piece for air convenience
网友回答：我们已经把管子切成1米长一只以便于空运----We've cut the pipe into one meter long simply for air transportation
网友回答：In order to be carried by air freight ,we he cut the pipe into 1m lenght per.
网友回答：For air transportation, the pipe had been one meter long.
网友回答：The tubes he been cut into 1m/pce for air freight convenience.
网友回答：We he cut tubes into one meter long per piece in order to be air-shipped conveniently.
网友回答：The pipe, it had been cut into 1 m length, so that can be delivered by air freight