The sound is dynamic and natural thanks to the especially powerful drive units with ultra-lightweight membranes.
配上这个非常轻的膜做成的驱动单元，它使声音活灵活现，浑然天成。
2
Specialty pulps also may be used in combination with woodpulp to produce lightweight and ultra-lightweight printing and writing papers.
特种纸浆也可以结合木浆使用，来生产轻型和超轻的印刷书写纸。
3
Stanford scientists are harnessing nanotechnology to quickly produce ultra-lightweight, bendable batteries and supercapacitors in the form of everyday paper.