Practical cosmologists would like to see direct evidence for the reionization epoch before adding the missing chapter to their textbooks .
讲究实际的宇宙学家，希望在为教科书增补遗漏的章节前，能先看到再游离的直接证据。
2
Part one of the thesis is a contribution to the theoretical studies of the 21CMA project, one of NAOC's key project which aims at probing the epoch of reionization.