I'm very much a loner — I never go out.我这人非常孤僻，从不出门。In school I was a loner. I went my own way.在学校里我独来独往，我行我素。He was a paradox—a loner who loved to chat to strangers.他真是个矛盾人物，生性孤僻却又喜欢和陌生人闲聊。...
The DNA of chromatin must replicate before cell division.染色质DNA在细胞分裂之前必须复制.In human epithelial cells, sex chromatin appears as a small granule attached to the nuclear envelope.在人的上皮细胞中, 性染色质象个小颗粒,连在核膜上.In this condition,...