trail作为名词的本义，是“踪迹”，比如雪地上留下的脚印，小路上留下的气味，楼道里留下的血迹，顺着这些线索都可能找到谁路过这里。飞机拉线，烟飘过，都是trail。
作为动词，trail的含义丰富，比如跟踪。
“Sam suspected they were trailing him.”
作为动词的另一个含义是“be losing to an opponent in a game or contest”，输给了对手，落后于对手。
“the Packers were trailing 10–6 at halftime”
https://link.storjshare.io/raw/jufhmhv3meqxn52jai4jg2mjbgua/production/255736276888eb02b06480f9b6cbb69d8e9264a8c42905e0777066092bd3abbe.JPG
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quoting nevent1q…q24uMorning Report — How long will Nikki Haley stay in?
Will she stay in, or is Nikki Haley on her way out of the Republican presidential race after trailing former President Trump in Iowa and New Hampshire? The former South Carolina governor, who vows to challenge Trump in her home state on Feb. 24, taunted the frontrunner during a rally in North Charleston on Wednesday... #press
https://thehill.com/newsletters/morning-report/4428463-how-long-will-nikki-haley-stay-in/?utm_source=press.coop
