您要查找的是不是：
- An electrically produced graph or tracing. 电示图以电制作的图表或映描图
- Intelligence frequency search and trace. 智能搜索波形，锁定和跟踪频率。
- I can't trace that letter you sent me. 我找不到你寄给我的那封信。
- He spoke without a trace of emotion. 他说话时毫不动感情。
- A record or tracing produced by a plethysmograph. 体积描记图由体积描记器作出的记录或轨迹
- He varied the transmission frequency. 他变换了无线电传送的频率。
- Did the police find any trace of the murderer? 警方找到凶手的行踪了吗？
- They failed to find any trace of the runaways. 他们未能找到逃跑者的任何踪迹。
- There was barely a trace of salt in the soup. 汤里简直一点盐也没有放。
- A unit of frequency equal to one cycle per second. 赫兹频率的单位，等于每秒一周
- The post office tried to trace the lost letter. 邮局设法查出那封丢失的信。
- The kids are learning to trace the letter. 孩子们学描字母。
- He always spoke with a trace of sarcasm. 他说话总带着一丝讽刺。
- Design and Realization of Double Trace Frequency Meter with Equal Precision Measurement 基于等精度原理双踪频率计的设计
- The powerhouse was trace out accurately later on a large scale map. 后来发电站被精确地描画在大比例地图上。
- Fatal accidents have decreased in frequency over recent years. 近年来死亡事故发生的频率已经下降。
- A faint or fleeting indication; a trace. 模糊的暗示模糊的或一闪即逝的暗示; 迹象
- The country woke from her trace of two hundred years. 这个国家在沉睡了200年之后觉醒过来了。
- The rain flushed away the trace left by the criminals. 大雨把犯罪分子遗留的痕迹冲刷掉了。
- We can often correlate age with frequency of illness. 年龄的大小往往与发病率有关。
