1. 蚕老结茧。2. 比喻出仕。3. 比喻妇女怀孕生育。
鸟用树枝筑巢来容纳它们的蛋和雏鸟，有些昆虫在生长和蜕变时作茧自保。
Birds build nests out of sticks to hold their eggs and baby birds. Some insects build cocoons around themselves for protection while they grow and change.
作茧和筑巢这两个词在20多年前开始流行，它们用于描述首次购房并在家里添置许多家具的人， 然后他们会生儿育女。
The terms cocooning and nesting became popular more than twenty years ago. They describe people buying their first homes and filling them with many things. These people then had children.
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