感光胶片的支持体，是一种具有透明、柔软特性和一定机械强度的塑料薄膜，它的特性构成了胶片的主要物理机械性能。
作覆面物料和照相菲林的片基用。
Used as a stable overlay material and as a photographic film base.
将碘硫酸奎宁的微观针状晶体嵌于塑料片基之中。
Microscopic needle-shaped crystals of herapathite are embedded in a plastic base.
因为每条腺嘌呤尾都“平躺”在片基上，加快了速度。
This is because each adenine tail lies flat on the substrate, taking up space.
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