New supersonic business jets under development will make that a lot worse.

正在开发的新型超音速商务喷气机将使情况变得更糟。

Scott Neal, senior vice president of Gulfstream, says the market for business jets is booming in China.

湾流航空公司高级副总裁斯科特·尼尔说，中国的商务飞机市场正在高速发展。

Spike, another American firm with supersonic ambitions, is developing an 18-seat business jet that doesn't make a loud boom.

另一家有超音速野心的美国公司Spike正在开发一种18座的低音爆公务机。

Back in this country, the Environmental Protection Agency finalized the first regulations of greenhouse gas emissions from airliners and large business jets.

国内新闻，环境保护署最终确定了第一个有关客机和大型公务机温室气体排放的法规。

The Phoenix-based firm offers  products and services to major planemakers, the business jet market, and even the general aviation  market.

这家位于凤凰城的公司为主要飞机制造商、公务机市场，甚至通用航空市场提供产品和服务。

The Gulfstream four is typically a business jet, but this one is reconfigured and its business is to help protect lives.

格鲁曼四型飞机通常是一种商务喷气式飞机，但这种飞机经过改装，它的业务是帮助保护生命。

National regulations banning supersonic speeds over land rule out trips across North America, home to lots of business travellers and most of the world's business jets.

美国法规禁止在本土超音速飞行，这就排除了穿越北美航行的可能性，而北美是众多商务旅行者和世界上大多数公务机的所在地。

Aerion, another firm that hoped to build an 8-10-seat business jet, unexpectedly folded in May despite orders worth more than $11bn and backing from Boeing, America's giant aeroplane-maker.

另一家公司Aerion希望打造一款8座到10座的公务机，尽管获得了超过110亿美元的订单和美国飞机制造巨头波音的支持，却在5月出人意料地倒闭了。

Today, you can mostly find aft-mounted  engines on private business jets and small regional jets like the CRJ series. But why did tail-mounted engines go out of fashion for commercial jets in  favor of the under-wing engine design?

今天，您可以在私人公务机和小型支线飞机（如 CRJ 系列）上找到后置发动机。但是，为什么尾部安装的发动机在商用喷气机中过时了，转而采用翼下发动机设计？