阅读下面短文，将文中划线句子译成中文。
　　Some kids in boarding school often like to talk with their roommates. ____ They won’t stop talking until someone comes to stop them. This is the reason why many of them are sleepy in class the next day. Lack of (缺乏) sleep is bad for their health. Growth hormones (生长激素) are very important if one is to grow taller. ____ The body makes the most hormones between 10 p.m. and 2 a.m. While you are asleep. ____ This means that if you don’t get to sleep at the time, you won’t grow taller.

乌拉尔河发源于乌拉尔山脉南部，流经俄罗斯及哈萨克斯坦注入里海，全长2428千米，是世界第四大内流河，为欧洲与亚洲的界河。读图，乌拉尔河不同河段有明显差别，下列叙述正确的是(    )