n.可逆性；反轉(zhuǎn)性；可撤銷性
Because of the reversibility of methylation, the drugs reducing the level of methylation become a new way to cure leukemia. 由于甲基化的可逆性，降低甲基化水平的藥物就成了治療白血病的新手段。
n.不可逆轉(zhuǎn)；不可挽回
