Analysis:

The first hospital can be directly translated into the first hospital. Examples are as follows:

Wang Guiqiang works in Peking University No.1 Hospital.

Wang Guiqiang and Peking University are together? First of all? Hospital.

First use:

1 and first can be used as numerals.

When used as ordinal number, first means "the first (individual, batch), the first [several]", which is often used to determine articles.

As an adjective, First generally modifies singular nouns. When modifying plural nouns modified by several or numerals, plural nouns are regarded as a whole. When first is used with radix, it is usually placed before radix, but the fixed phrases caused by first should be placed after radix.

When First is used as a "not at all" solution, it is often used in negative sentences.

2.first can be used as an adjective

As an adjective, First generally modifies singular nouns. When modifying plural nouns modified by several or numerals, plural nouns are regarded as a whole. When first is used with radix, it is usually placed before radix, but the fixed phrases caused by first should be placed after radix.

When First is used as a "not at all" solution, it is often used in negative sentences.