I have a 5D Mark IV that I would later use, but at first I was a bit wary of leaving so much money outside in Brooklyn.
我有一台 5D Mark IV, 以后会用到,但起初我有点担心把这么多钱留在布鲁克林外面。
英语百科
Mark IV
Mark IV or Mark 4 often refers to the fourth version of a product, frequently military hardware. "Mark", meaning "model" or "variant", can be abbreviated "Mk."