Please tell me what's the difference between wireless optica

can anyone tell me what's the difference between while and w could anyone tell me what is the difference between british What's the difference between"oblique" and "slant"?Please ex 英语what's the difference/different between... What's the difference between them? what's the difference between"clear" What's the difference between lucky & fortunate Please tell the difference between this one and that one. who can tell me the difference between manager,director and Can you tell me the difference between "ill"and "sick"? tell me the difference between"deny"and"negate",thanks! Could you tell me the difference between WAR and BATTLE?