例句與造句

1. Epigenetic alterations in cell - type - specific gene expression control the transition of neural stem cells ( nscs ) from predominantly neurogenic to predominantly gliogenic phases of differentiation , but how this switch occurs is unclear
   細胞類型特異的基因表達之表觀遺傳學改變控制著神經(jīng)干細胞由神經(jīng)元發(fā)生為主向膠質(zhì)細胞發(fā)生為主的轉(zhuǎn)變，但是這一時相的切換機制還不清楚。
2. It's difficult to find expression controls in a sentence. 用expression controls造句挺難的