This is the 2712th most frequent Chinese word.
個國
"個國" means "individual country" or "specific country" in English.
Here, '個國' is used to refer to a specific country ('這個國家'). '個' acts as a classifier suggesting singular specificity.
這個國家的歷史非常悠久。
This country's history is very long.
In this instance, '個國' emphasizes individual countries ('每個國'). '個' serves to quantify and differentiate singular entities within a plural context.
每個國的文化都各有特色。
Each country's culture has its unique characteristics.
The phrase '個國' queries for the collection of countries ('什麼是地球上的個國'). '個' implies specification within the broader category of '國'.