您要查找的是不是：
- The luminous intensity on unit area. 单位面积上的发光强度。
- An electrically produced graph or tracing. 电示图以电制作的图表或映描图
- 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。
- The family is the smallest social unit. 家庭是社会最小的单位。
- 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
- 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。
- Pressure is force per unit area. 压力就是电单位面积上的力。
- There was barely a trace of salt in the soup. 汤里简直一点盐也没有放。
- A set of data elements which are handled as a unit. 作为一个单元来处理的一组数据元素。
- The post office tried to trace the lost letter. 邮局设法查出那封丢失的信。
- The family is the basic unit of society. 家庭是社会的基本单位。
- 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。
- A metric unit of area equal to 10 ares. 十公亩面积的公制单位之一，等于十公亩。
- A metric unit of mass equal to 100 grams. 百克公制质量单位，等于100克。
- A unit of power equal to 1,000 watts. 千瓦功率的单位，等于1,000瓦。
- 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。
- A unit of frequency equal to one cycle per second. 赫兹频率的单位，等于每秒一周
