trace amount

例句：

1. 1. The detective was able to trace the thief's location through his phone records.
   侦探通过手机记录追踪到了小偷的位置。
2. 2. She traced her steps back to the spot where she had left her keys.
   她追溯到她离开钥匙的地方。
3. 3. The scientist used a microscope to trace the chemical composition of the sample.
   科学家使用显微镜来追踪样本的化学成分。