自然更新

凉水自然保护区松鼠（sciurus vulgaris）重取贮点及其与红松（Pinus koraiensis）天然更新关系

檀香的自然更新与直播造林技术

liquified natural gas

natural system

natural fleckle-eliminating cream

natural oscillation

natural stone

liquified natural gas tank【水运】

natural resin

natural circulation