main level 請問這是什麼意思呢~?

Main level is the level where you can enter and exit the building on foot.
Depending on the construction of the building, the main level could be at any floor.

Level the ground off=the ground level.You the builder should build on the level, not on the 45'slope where your car and people enter the sitting room from the back.You can plan on your basement Or 45' basement naming all the entrances to the house as level ground level; as illustrated.

main level應該是主層的意思
So this is the main level意思是所以這裡是主層

通常指的是大廳, 主要出入樓層

There is no meaning.

Main level is based on the building, which is just a name for the level. You can designate a basement as main level if you want.