This study investigates an under-researched complex communicative act called “cancellation of an obligation”, produced by Chinese, Danish and British business professionals in both L1 and ELF contexts. It is embedded in an implicitly meta-interactional context consisting of a speaker’s...

Self-propelled autonomous devices have great significance in energy, environment, and biomedical engineering, and thus vast achievements have been made in recent years. However, conventional propulsion often requires special chemicals or external energy, which restricts their practical...