一次重感冒用英语怎么翻译？

重感冒:a badly cold
两个盒子中间：at the middle of the two boxes
at once 立即，马上
stay in bed 呆在床上
上车get on
a quarter to seven七分之四

一次重感冒：a bad cold
得了重感冒： have a bad cold
lie on one's back 仰卧
a quarter to seven 意思是 6：45 相当于： six forty-five
在两只盒子中间 between the two boxes
at once 立刻，马上
stay in bed 躺在床上
上车 get on the bus

一次重感冒:A heavy cold
lie no one's back:没有躺著的背面
a quarter to seven :四分之一到七
在两只盒子中间:At?Only box in?
at once? stay in bed? :立刻? 留在床上?
上车:go bus