  In this manuscript, we provide a summary of accelerator design and the key
challenges of the CEPC accelerator, both of which are laid out in detail in the
Conceptual Design Report (CDR) released in November 2018. We also outline
future directions and challenges. In the Addendum, we briefly describe the
planning and the international organization of the CEPC. The next step for the
CEPC team is to perform detailed technical design studies. Effective
international collaboration would be crucial at this stage. This submission for
consideration by the ESPP is part of our dedicated effort in seeking
international collaboration and support.
