Trailer
来自Big Physics
wiktionary
From trail + -er. The film sense derives from the fact that previews were formerly shown after the main feature, rather than before as is usual today.
etymonline
trailer (n.)
1580s, "hound or huntsman that follows a trail," agent noun from trail (v.). From 1610s as "Something that trails." From 1890 as "vehicle pulled by another;" originally a small carriage drawn along by a bicycle. Meaning "preview of a coming movie" first attested 1928. Trailer park "mobile home community" recorded by 1936. Trailer trash in use by 1986.
