减数分裂是形成染色体减半的生殖细胞的关键步骤。

___Meiosis is a crucial step in the formation of reproductive cells with half the chromosomes.

他把自己的诺贝尔奖称为'小小的成就'，真是个典型的低调说法。

Calling his Nobel Prize 'a small achievement' was a perfect example of ___meiosis.