Flying from canada to guangzhou china

Oh, I found some information on the official website of the airline.
If you bought the first-class ticket, you can take 3 pieces of checked cases at most for free; each of them should not weigh over 32kg;
For business cabin and economy cabin, the free allowance is 2 pieces; but the weight ceiling is 32kg/per piece for business cabin and 23kg for economy cabin;
No matter which cabin you are in, the dimension of each case should not exceed 158cm; or, you should pay for extra volume.