重点讲解：
1. tamper with 篡改，擅自改动，胡乱摆弄（尤指有意破坏）；
He found his computer had been tampered with.
他发现他的电脑被人动过手脚mH3C*)UPQIUl7arWtxa(。
2. rule out 排除；不予考虑；
Police have not ruled out the possibility that the man was murdered.
警方尚未排除那个男子是被谋杀的可能性-#jDF~SN+R[。
3. track down 追踪到；追查到；搜寻到；
The police have so far failed to track down the attacker.
警方至今未能追捕到攻击者UtoJ4-fLOASZ@v0。
4. come into contact with 接触；
By work, people come into contact with each other.
通过工作，人们彼此接触F;sz~L+msL[m。