abroad
adv.
mid-13c., "widely apart," from Old English on brede, which meant something like "at wide" (see a-(1) + broad, adj.). The sense "out of doors, away from home" (late 14c.) led to the main modern sense of "out of one's country, overseas" (mid-15c.).
〔李〕[a-=on 在…；broad a. 宽的⇒“on a broad side 在很远的一边”→] ad. ＆ a. outside one's own country 在国外