延长 + Duration/Object
延长 (yáncháng) means "to extend" or "to prolong" in terms of time or length. It is commonly used in formal contexts to describe extending deadlines, durations, or periods. For example, 延长假期 means "to extend a holiday."
由于疫情,学校决定延长寒假两周。
yóuyú yìqíng, xuéxiào juédìng yáncháng hánjià liǎng zhōu.
Due to the pandemic, the school decided to extend winter break by two weeks.
这条地铁线路将向南延长五公里。
zhè tiáo dìtiě xiànlù jiāng xiàng nán yáncháng wǔ gōnglǐ.
This subway line will be extended five kilometers to the south.
签证可以申请延长三十天。
qiānzhèng kěyǐ shēnqǐng yáncháng sānshí tiān.
The visa can be applied for a thirty-day extension.