masquerading
冒名頂替
Mas·quer·ade, v. i. [imp. & p. p. Masqueraded; p. pr. & vb. n. Masquerading.]
1. To assemble in masks; to take part in a masquerade.
2. To frolic or disport in disquise; to make a pretentious show of being what one is not.
A freak took an ass in the head, and he goes into the woods, masquerading up and down in a lion's skin. --L'Estrange.