词典释义：
a mark or a series of signs or objects left behind by the passage of someone or something
足迹，痕迹，踪迹
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a trail of blood on the grass .草上的血痕。
a track or scent used in following someone or hunting an animal
（跟踪某人的）踪迹；（追踪动物的）臭迹
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police followed his trail to Dorset .警察跟踪他到了多塞特。
a part, typically long and thin, stretching behind or hanging down from something
（尤指细长）一缕，一串
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smoke trails 烟缕
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trails of ivy .常青藤串。
a line of people or things following behind each other
人或物排成的长队
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we drove down in a trail of tourist cars .我们随着游客车流一路开车下来了。
a beaten path through rough country such as a wood or moor
（荒野）小路，（树林、沼泽中踩出来的）小道，小径。
a route planned or followed for a particular purpose
特定路线，路径
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the tourist trail .旅游路线。
(亦作
〈北美〉 滑雪坡，滑雪道，越野滑雪路线。
short for
<Bold>TRAILER</Bold> （义项2）的简称。
t he rear end of a gun carriage, resting or sliding on the ground when the gun is unlimbered
（炮架的）架尾。
[with adverbial]draw or be drawn along the ground or other surface behind someone or something
拖，拉
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[with obj.]
Alex trailed a hand through the clear water 亚历克斯伸出一只手在清澈的水中划过
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[no obj.]
her robe trailed along the ground .她的长袍拖在地上。
[no obj.](typically of a plant)grow or hang over the edge of something or along the ground
（尤指植物）蔓生，蔓延
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the roses grew wild, their stems trailing over the banks .玫瑰一阵疯长，茎蔓延到了堤上。
[with obj.]follow (a person or animal), typically by using marks, signs, or scent left behind
（尤指根据痕迹、气味）追踪（人，动物）。
[no obj.]be losing to an opponent in a game or contest
（在游戏、比赛中）落后
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[with complement]
the defending champions were trailing 10-5 at half-time .冠军卫冕队在半场时，以 １０比５ 落后。
[no obj., with adverbial of direction]walk or move slowly or wearily
拖沓行走；慢吞吞地走，没精打采地走
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she trailed behind, whimpering at intervals .她慢吞吞地走在后面，不时地抽泣。
(of the voice or a speaker)fade gradually before stopping
（声音，喇叭）渐弱
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her voice trailed away .她的声音渐渐地低下去了。
[with obj.]advertise (something, especially a film or programme) in advance by broadcasting extracts or details
事先宣传，预告（影片、节目等）。
[with obj.]apply (slip) through a nozzle or spout to decorate ceramic ware
喷注（泥釉）。
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at the trail Military with a rifle hanging balanced in one hand and （in Britain） parallel to the ground 【军】 取提枪姿势 -
trail arms Military let a rifle hang in such a way 【军】 提枪 -
trail one's coat deliberately provoke a quarrel or fight 挑衅，寻衅滋事
"Middle English （as a verb）： from Old French
