lǚxíng shí mǎi jǐ zhāng míngxìnpiàn jì gěi péngyou, yě shì hěn chángjiàn de zuòfǎ

旅行时买几张明信片寄给朋友，也是很常见的做法。

Buying a few postcards to send to friends while traveling is also a common practice.