loop

loop
noun

a shape produced by a curve that bends round and crosses itself
环，圈
■a length of thread, rope, or similar material, doubled or crossing itself, typically used as a fastening or handle
（线、绳或类似材料的）环，扣，圈
■a curved stroke forming part of a letter (e.g. b, p)
字母的环形部分（如b, p)
■(亦作 loop line)a length of railway track which is connected at either end to the main line and on to which trains can be diverted to allow others to pass
（可改道的）会车线
■(亦作 loop road)a stretch of road that diverges from a main road and joins it again
环行路
■(亦作 loop-the-loop)a manoeuvre in which an aircraft describes a vertical circle in the air
翻筋斗
■(Skating)a manoeuvre describing a curve that crosses itself, made on a single edge
(滑冰)单刃转圈
■(dated)a contraceptive coil
(旧)节育环
■short for induction loop
induction loop. 的简称
a structure, series, or process the end of which is connected to the beginning
环状结构（或系列）；循环过程
■an endless strip of tape or film allowing continuous repetition
无限循环
■a complete circuit for an electric current
回路
■(Computing)a programmed sequence of instructions that is repeated until or while a particular condition is satisfied
(计算机)循环

verb

[with obj. and adverbial]form (something) into a loop or loops; encircle
环绕
she looped her arms around his neck.
她把胳膊绕在他的脖子上。
■[no obj., with adverbial]follow a course that forms a loop or loops
绕行
the canal loops for two miles through the city.
运河在城里绕了两英里。
■put into or execute a loop of tape, film, or computing instructions
放磁带；放电影；运行计算机指令
■(亦作 loop the loop)circle an aircraft vertically in the air
绕着飞机翻筋斗

常用词组
in (或 out of) the loop

(informal, chieflyUS)aware (or unaware) of information known to only a privileged few
(非正式，主美)（不）了解内幕

throw (或 knock) someone for a loop

(N. Amer. informal)surprise or astonish someone; catch someone off guard
(北美，非正式)使惊奇，突袭

语源

late Middle English: of unknown origin; compare with Scottish Gaelic lùb 'loop, bend'

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