求翻译：主要替代品是洲际高速公路上的列车。西南航空公司具有航班次数多、价格低、服务准时、速度快等优点，都是高速汽车无法到达的，因此替代品的威胁弱。是什么意思？

The main alternative to the train on the interstate highway. Southwest Airlines has a number of flights, low price, on time service, speed, are the high-speed vehicles can not reach, so the threat of substitutes is weak.

Main substitutes are intercontinental train on the highway. Southwest Airlines has a flight number, low prices, fast service, on time, etc, are all high-speed motor vehicle cannot be reached, so the threat of substitutes.

The main substitute is on the intercontinental highway train.Southwestern Airlines has the scheduled flight number of times many, the price low, the service punctual, the speed quick and so on the merits, all is the high-speed car is unable to arrive, therefore the substitute threat is weak.

Trains on the main alternatives are Interstate Highway. Southwest Airlines has a number of flights, low price, on time, the advantages of speed, cannot be reached by high-speed cars, so threat of substitutes and weak.

正在翻译，请等待...