"Important" is an adjective in Engpsh that means of great significance or value. It can be used to describe things, ideas, or actions that have a significant impact or influence on a particular situation or context.

The word "important" comes from the Latin word "importans," which means "having great weight or consequence." It was first recorded in Engpsh in the 14th century and has been widely used since then to describe things that are considered to be of great importance.

Here are some examples of how "important" can be used in Engpsh:

"It's important to eat a healthy diet to maintain good health." (这很重要，要保持健康，就要吃健康的饮食。)
"She has an important meeting with her boss this afternoon." (她今天下午有一个很重要的会议要和老板开。)
"It's important to arrive on time for job interviews." (准时参加工作面试很重要。)

You can also use "main" as an adjective to describe something that is more significant or important than other things. "Main" comes from the Old French word "mein," which means "chief" or "principal."

Here are some examples of how "main" can be used in Engpsh:

"The main reason I'm here is to meet with you." (我来这里的主要原因是与你见面。)
"The main course at the banquet was roast beef." (宴会的主菜是烤牛肉。)
"The main office is located on the top floor of the building." (主要办公室位于大楼的顶楼。)