Chromosomes also determine the sex of animals.染色体也决定动物的性别.Each of four chromosomes divide longitudinally.四种染色体的每一种都沿着纵向分裂.At this point esch chromosome consist of a pair of chromatids and the two associated chromosomes a...
在那一刻见到马库斯是非常令人兴奋的事。Seeing Marcus at that moment was a great tonic.她身体前倾，眼里闪动着兴奋的光芒。She leaned forward, her eyes bright with excitement.梅格处于一种兴奋的期待中。Meg was in a state of fevered anticipation....