重点词汇词组：

1.The UN1 has warned2 that a humanitarian disaster is unfolding in Afghanistan3 as the Taliban advance has forced half a million people from their homes4.

humanitarian disaster 人道主义灾难

eg: Those in the area describe it as a "humanitarian disaster zone".

该地区的人将其描绘为一个“人道灾难区”。

unfold 展开，打开；透露，展现

eg: She unfolded a deckchair and sat down.

她打开躺椅坐了下来。

长难句解析：

解：1为主句的主语，2为主句的谓语，3为主句的宾语从句，其结构为主语+系动词+表语。

析：4为as引导的原因状语从句，其主语是the Taliban advance，谓语是has forced，其他部分为宾语。

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