生生 (shēng shēng) is a reduplicated expression with roots in Buddhist philosophy, where it refers to the continuous cycle of birth and death (reincarnation). In modern Chinese, it carries the sense of 'endlessly' or 'relentlessly' when used as an adverb, often in fixed phrases like 生生不息 (endless reproduction) or 生生世世 (generation after generation). It can also function as a verb meaning 'to produce continuously' in literary or technical contexts.