You can see it in sight, but you can't reach or get close to it. Often used to describe things that cannot be achieved at present.
Crouching Tiger, Hidden Dragon refers to hidden dragons and crouching tigers, and also refers to hidden talents.
Car dust marks refer to the traces of cars and horses passing by.
Short scale means that everything has its shortcomings and is not suitable in all cases.
Out of reach: close. You can see it, but you can't reach or get close to it. Often used to describe things that cannot be achieved at present.