In the M2 and M3 generation, the average frequencies of mutation in chionic irradiation had increased by 23% and 70% over the acute irradiation of dry seeds respectively.是什么意思_In the M2 and M3 generation, the average frequencies of mutation in chionic irradiation had increased by 23% and 70% over the acute irradiation of dry seeds respectively.在线翻译_英语_读音_用法_例句