1
- a shape produced by a curve that bends round and crosses itself环, 圈。
1.1
- 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。
1.2
- a curved stroke forming part of a letter (e.g. b, p)字母的环形部分（如b, p）。
1.3
- （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。
1.4
- （亦作loop road）a stretch of road that diverges from a main road and joins it again环行路。
1.5
- （亦作loop-the-loop）a manoeuvre in which an aircraft describes a vertical circle in the air翻筋斗（一种飞行特技）。
1.6
- Skating a manoeuvre describing a curve that crosses itself, made on a single edge【滑冰】单刃转圈。
1.7
- dated a contraceptive coil〈旧〉节育环。
1.8
- short for INDUCTION LOOP.INDUCTION LOOP的简称。
2
- 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。
2.1
- an endless strip of tape or film allowing continuous repetition（连续反复播放音像的）循环播放胶片（或磁带）。
2.2
- a complete circuit for an electric current回路。
2.3
- Computing a programmed sequence of instructions that is repeated until or while a particular condition is satisfied【计算机】循环。
with obj. and adverbial
1- form (something) into a loop or loops; encircle把…绕成环（状）; 环绕, 围住：
she looped her arms around his neck.
她的胳膊搂住了他的脖子。
1.1
- no obj., with adverbial follow a course that forms a loop or loops环行, 绕行：
the canal loops for two miles through the city.
运河在城里绕了两英里。
1.2
- put into or execute a loop of tape, film, or computing instructions装入一卷磁带（或胶片）; 输入计算机指令; 播放一卷磁带; 放一卷电影胶片; 执行计算机指令。
1.3
- （亦作loop the loop）circle an aircraft vertically in the air使飞机翻筋斗。
短语
in（或out of）the loop
- informal, chiefly US aware (or unaware) of information known to only a privileged few〈非正式, 主美〉了解（或不了解）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; 使大为惊异; 冷不防（或出其不意）地捉住。
词源
late Middle English: of unknown origin; compare with Scottish Gaelic lùb 'loop, bend'.