Or if you prefer your own company, Chinese firm Ehang are pioneering a single-seater drone, which stays airborne for 23 minutes.

或者如果你更喜欢自己的公司， 中国公司 Ehang 正在开发一种单座无人机， 它可以在空中停留 23 分钟。

Two exceptions to the general rule are Boeing, America's biggest aircraft-maker, which has teamed up with Wisk Aero, a Californian firm, to produce a four-seater, and a two-seater being tested by Ehang, another Chinese firm.

一般规则的两个例外是美国最大的飞机制造商波音公司，该公司已与加利福尼亚公司 Wisk Aero 合作生产四人座飞机， 另一家中国公司 Ehang 正在测试双人座飞机。