understatement for rhetorical effect (especially when expressing an affirmative by negating its contrary); "saying `I was not a little upset'' when you mean `I was very upset'' is an example of litotes" 同义词:litotes,
(genetics) cell division that produces reproductive cells in sexually reproducing organisms; the nucleus divides into four nuclei each containing half the chromosome number (leading to gametes in animals and spores in plants) 同义词:miosis, reduction division,
百科解释
Meiosis () is a special type of cell division necessary for sexual reproduction in eukaryotes. The cells produced by meiosis are gametes or spores.