看看1978年铁路网的需求，在中国改革开放之初，铁路货物发送量10亿吨。而现在每年的货物发送量已达到40亿吨。
Looking at the demand on the rail network , for example , back in 1978 , at the start of China 's reform and opening up , 1 billion tons of freight were carried by rail .
铁路货物发送量