He gave himself a newname to hide his identity when he went to carry out the secret task.
他执行一项秘密任务时,给自己起了一个新的名字来掩盖身份。
3
The Menches brothers were selling pork sandwiches at a fair in 1885, but when there was no more pork, they used minced beef and gave it a newname, the "hamburger".