Here are two ways to answer this friend's two questions.
? What do you mean by "one" and "two"? (A) broad
"Wide" means high and empty, for example, Qu Yuan has a saying "wide and lawless", in which "wide" means high and empty;
"Guang" can also be extended from lofty and empty meaning to broad-minded and broad-minded meaning. For example, "a broad-minded person" refers to a scholar with a broad mind and high aspirations.
? (2) Broad
"Vast" refers to a vast distance, such as vast land, vast ocean and vast territory. Li Shangyin has a poem "Tianchi is wide, who treats whom", in which "wide" means Tianchi is far wide;
"Vastness" can also be extended to live far apart. For example, there is a saying in the Biography of Northern History and Han Qilin that "Haohan" means to go far away.
? Second, what is the difference between vastness and vastness? (1) Different meanings
"Vast" means sublime and empty, extended to ambitious and broad-minded, and "vast" contains distant and broad meaning, which leads to the meaning of wanting to go far away. This is an obvious difference in the sense of the two.
? (B) the focus is different
The focus of "vastness" is "sublimity", focusing on the depth and breadth of expression space. For example, Wan Li Frost in Liaokuo Jiangtian expresses the depth and breadth of Jiangtian with Liaokuo, and the "Liaokuo" in Liaokuo refers to the infinity of the universe. And "vastness" focuses on "vastness" and focuses on the large area, such as "vast grassland" and "vast land".
? (3) Different users
"Vastness" is used for vision, sky, sky, river sky, sky and so on. For example:
1. Standing on the top of the mountain, you can see villages and rivers in the distance.
She once saw the vast sky in the garden, and she also looked at the end of the world.
They dedicated the lingering flute to the boundless grassland and the vast blue sky.
There is a bright red lamp hanging on the high mast, which stands out in the vast silver-blue night sky. People can see the vastness of the boundless and bottomless sky.
And "vast" is generally used in land, grassland, ocean and other aspects, such as: vast sea, vast Yuan Ye, vast land and so on.
Judging from the above differences, these two words cannot be confused, and each has a clear scope of application.