Cos, people also put " cos" , not just " bcos" , but they just put " cos" , because when people are speaking, they sometimes say " cos" instead of " because" just if they're speaking quickly and informally.

Cos，人们也放“cos” ，而不仅仅是“bcos” ，但他们只放“cos”，因为当人们说话时， 他们有时会说“cos” 而不是“because” ，只是如果他们说话很快且不拘礼节。