Career objectives are usually very brief and start with “To…”, e.g “To bring…” or “To work…”.
In short, it states what you plan to do and what your “objective” actually is.
Your cover letter should not just reiterate what you’ve already written in the CV. Of course, several things may be similar, but you don’t want to be giving the employer two pieces of paper with the same things written in two different ways.