a trace of sth
用 a trace of 表示极少的量或轻微的迹象，后接不可数名词或抽象名词。
There was a trace of sadness in her voice.
她的声音里有一丝伤感。
痕迹；踪迹；迹象
微量；一丝；些许；（电路板上的）导线；线路；走线；追踪；追溯；描摹；（干旱地区的）小径；土路；（寻找丢失邮件等的）查询
a mark or sign left by someone or something that was present
追踪的行为。
An act of tracing.
刚刚可检测到的数量
a just detectable amount
对丢失物品(如信件或快递包裹)的查询。
An enquiry sent out for a missing article, such as a letter or an express package.
某物曾存在的迹象
an indication that something has been present
作为人或动物经过的标记。
A mark left as a sign of passage of a person or animal.
某种品质的暗示
a suggestion of some quality
极少量,通常是残留的某种物质或材料。
A very small amount, often residual, of some substance or material.
印刷电路板上的导电路径。
A current-carrying conductive pathway on a printed circuit board.
干旱地区的非正式道路或显著路径。
An informal road or prominent path in an arid area.
马具上的两根带子、链条或绳索之一,从项圈或胸甲延伸到连接车辆或要拉的物体的横木；拉绳。
One of two straps, chains, or ropes of a harness, extending from the collar or breastplate to a whippletree attached to a vehicle or thing to be drawn; a tug.
连接杆或杆件,用于传递运动,尤其是从一个平面到另一个平面；特别是在风琴停止动作中用于传递运动的部件。
A connecting bar or rod, pivoted at each end to the end of another piece, for transmitting motion, especially from one plane to another; specifically, such a piece in an organ stop action to transmit motion from the trundle to the lever actuating the stop slider.
工程或建筑的平面图。
The ground plan of a work or works.
投影平面或原始平面与坐标平面的交线。
The intersection of a plane of projection, or an original plane, with a coordinate plane.
方阵对角线元素的总和。
The sum of the diagonal elements of a square matrix.
在句法结构中占据某个位置的空类别,用于解释如wh-移动和被动等结构。
An empty category occupying a position in the syntactic structure from which something has been moved, used to explain constructions such as wh-movement and the passive.
一系列指令,包括分支但不包括循环,针对某些输入数据执行。
A sequence of instructions, including branches but not loops, that is executed for some input data.
在缺乏稳定所指时的近似能指。
A signifier approximated in the absence of stable signified.
The test found a trace of lead in the drinking water.
检测发现饮用水中有微量的铅。
用法提示：trace 作名词，表示“微量、一丝”，此处强调极少量的存在。
AI contextual example
She spoke calmly, but there was a trace of nervousness in her voice.
她说得很平静，但声音里有一丝紧张。
用法提示：trace 作名词，表示“一丝、些许”，用于描述某种情感或特征的细微痕迹。
AI contextual example
After the rain, only a trace of the chalk drawing remained on the sidewalk.
雨后，人行道上只剩下粉笔画的一点点痕迹。
用法提示：trace 作名词，表示“痕迹、残留的少量”，指原来的东西所留下的少量残余。
AI contextual example
用 a trace of 表示极少的量或轻微的迹象，后接不可数名词或抽象名词。
There was a trace of sadness in her voice.
她的声音里有一丝伤感。
复数 traces 常指残留的痕迹、迹象，多用于具体物质或证据。
The police found traces of blood in the car.
警方在车里发现了血迹。
without a trace 是固定搭配，表示完全消失、不留任何痕迹。
The plane disappeared without a trace.
那架飞机消失得无影无踪。
track侧重连续留下的痕迹，如脚印或车辙
trail常指人或动物走过留下的痕迹序列，可能包括气味
footprint特指脚踩过的印痕
impression指物体按压留下的形状，强调压印
grammar · medium
易错句子There is trace of blood on the knife.
正确表达There is a trace of blood on the knife.
trace 在此表示“微量；一丝痕迹”，是可数名词；单数可数名词前必须有限定词（a/the/every 等），不能裸用。汉语“有……的痕迹”本身不带冠词，直译时就会漏掉 a，正确说法是 a trace of。
grammar · medium
易错句子The scientist found several trace of lead in the water.
正确表达The scientist found several traces of lead in the water.
trace 是可数名词，被 several 这类表示不定复数量的词修饰时，名词必须用复数形式 traces（词尾加 -s）。汉语名词不随数量变形，只靠数词表达，所以学习者容易保留单数 trace，漏掉 -s。
一丝…；微量…
There was a trace of sadness in her voice.
她的声音里有一丝悲伤。
留下痕迹
The thief left no trace behind.
小偷没有留下任何痕迹。
无影无踪地
He disappeared without a trace.
他消失得无影无踪。
微量元素
Zinc is a trace element essential for health.
锌是健康必需的微量元素。
微量证据
The lab found trace evidence of gunpowder on his hands.
实验室在他的手上发现了火药的微量证据。
痕量；微量
The water contains trace amounts of lead.
水中含有痕量的铅。
痕迹常被视为证据的一种形式。
微量痕迹可成为破案线索。
脚印是常见的地面痕迹。
气味是难以察觉的痕迹。
痕迹可以表现为物体上的标记。
消失得无影无踪
The car vanished without a trace.
那辆车消失得无影无踪。
石沉大海；销声匿迹
Many small businesses sink without a trace during a recession.
许多小企业在经济衰退期间销声匿迹。
毫无痕迹；一点也没有
There was not a trace of sadness in her voice.
她的声音中毫无悲伤的痕迹。
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Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY, WORDNET.