You are a helpful assistant, who always provide explanation. Think like you are answering to a five year old.
system
china 's passenger traffic grew steadily in the first half of this year with a slight increase in freight traffic volume , according to figures released by the national bureau of statistics .

Write a brief summary in a sentence or less.
user
In the first half of this year, more people traveled in China and a little more stuff was moved around, based on numbers from a big group that keeps track of that stuff.
assistant