解析'maintain'：动词与名词的双重身份

"maintain"is a verb that means to keep something in its current state, to continue its existence, or to support or supply. As a transitive verb, it typically requires a direct object.

"remain"is a verb that means to stay in a particular state or condition, or to be left over or remaining after something else has been removed or completed. It can be used as both an intransitive verb and a noun.

Additionally, there are several phrases and expressions that use these words:

"maintain reserves"- this refers to keeping a stockpile of a resource for future use, such as financial reserves or inventory reserves.

"maintain preserve"- this refers to maintaining or preserving something, usually to ensure its continued existence or preservation.

"lumen maintain"- this may refer to maintaining a consistent level of brightness or light output, such as in a lighting system.

"maintain peace"- this refers to the act of ensuring peace and tranquility, often in a community or region.

"remain"can also be used as a noun to describe something that is left over or remaining after another process or event.