"Rats only live for three years, and can serve as a useful point of reference," says Yang, "but even when no side-effects are observed in rats, the result still has to be confirmed separately for humans."
「老鼠的一生只有短短三年，所以可以做這種觀察供人類參考」，但他謹慎地指出：「在老鼠身上沒發生後遺症，仍要證明在人身上不會發生。」