Some automakers are testing new types of batteries and keeping an eye on their development.

一些汽车制造商正在测试新型电池，并密切关注它们的发展。

Duval calls it  generic because the airplane isn't restricted to testing any one particular type of technology  - and certainly nothing specific to the 757.

Duval 称其为通用技术，因为这架飞机并不局限于测试任何一种特定类型的技术——当然也没有特定于 757 的技术。