求翻译：本文研究的是狭义的国防费支出概念，即在军事预算经费中(武警部队经费由国家单列除外)主要由中国人民解放军直接开支的部分，亦称军费。是什么意思？

This study is a narrow concept of national defense expenditures, which in the military budget (funded by the National separate armed forces excluded) the main part of direct costs by the People's Liberation Army, also known as military spending.

This paper studies the expenditures for national defense in the narrow sense, i.e. , concept in the military budget funds (armed police force separate from the State primarily by the People's Liberation Army (PLA) other than direct expenses, also known as part of the military.

This article studies is the narrow sense national defense expenditure disbursement concept, namely in the military budget funds (armed police funds by national single row exception) mainly by the Chinese People's Liberation Army direct expenditure part, also calls the military expenses.

This study is a narrower concept of national defense expenditures, that is, in the military budget (people's armed police force by the State except for the single row) part of the main expenditure directly by the people's Liberation Army, also known as military spending.

This study is a narrower concept of national defense expenditures, that is, in the military budget (people's armed police force by the State except for the single row) part of the main expenditure directly by the people's Liberation Army, also known as military spending.