ebay上买了点卡片，应该用哪种？
US $27.99 China USPS Express Mail InternationalTM Varies for items shipped from an international location
Seller ships within 2 days after receiving cleared payment - opens in a new window or tab.
US $27.99 China USPS Priority Mail InternationalTM Varies for items shipped from an international location
Seller ships within 2 days after receiving cleared payment - opens in a new window or tab.
US $27.99 China USPS First Class Mail InternationalTM Varies for items shipped from an international location
Seller ships within 2 days after receiving cleared payment - opens in a new window or tab.