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(cartContents) = chargeCreditCard(cartSummary, cartContents)

Филолог заявил о массовой отмене обращения на «вы» с большой буквы09:36

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This looked much better than what I had before. But it was a bandwidth hog.

window.innerWidth / window.innerHeight 是长宽比，保证画面不变形。