大部分有关癌症的基因变异还尚未被发现，他说。
Most of the genetic alternations associated with cancer have yet to be discovered, he said.
他说多细胞生命可能在多处地点演化，只是其化石尚未被发现而已。
He said multicellular organisms likely evolved in many places, but the fossils haven't yet been found.
一些学者甚至认为埃及可能存在上千处尚未被发现的遗址。
Some researchers are saying there might be thousands more unknown sites in Egypt.
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