tuō yùn xíng li tōng cháng àn jiàn shù hé zhòng liàng suàn, suí shēn xíng li hái huì kàn chǐ cùn

托运行李通常按件数和重量算，随身行李还会看尺寸。

Checked luggage is usually calculated by piece and weight, and carry-on luggage also has size restrictions.