您要查找的是不是：
- Kinetic spectrophotometric determination of trace ruthenium with fast green FCF 固绿FCF催化动力学光度法测定痕量钌
- Determination of Trace Ruthenium, Rhodium, Palladium and Gold in Geological Samples by Solvent Flotation-Partial Least Squares Regression-Spectrophotometry 溶剂浮选-偏最小二乘回归光度法测定地质样品中痕量贵金属元素
- 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。
- 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。
- 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。
- 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。
- trace ruthenium 痕量钌（Ⅲ）
- 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。
- A slight trace of color; a tinge. 色调轻微的一抹颜色; 色调
- The family can trace its history to the 17th century. 这个家族的历史可以追溯到十七世纪。
- Her fear of water can be trace back to a childhood accident. 她很怕水，起因可归于儿时的一次事故。
- Her family can trace its history back to the 15th century. 她的家史可追溯到15世纪。
- I can not trace my family tree back farther than my great-grand parents. 我无法把我的家谱追溯到我曾祖父母以前。
