延伸 yánshēn to extend
to extend; to spread
How to remember 延伸: 延 to defer + 伸 to extend = to extend.
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How it is used
- To extend / stretch out (physically or in scope): 道路向远处延伸 (dàolù xiàng yuǎnchù yánshēn) the road stretches into the distance; 话题延伸 (the topic extends).
- Emphasizes continuous prolongation in a direction - lines, roads, ideas, meanings.
- Compare 延长 (yáncháng, to lengthen/prolong esp. time/duration); 延伸 is more about extending outward in space or concept.