单语范例（未经PONS编辑处理）
This layer provides both chemical and physical protection, and can prevent macromolecules from contacting the cell membrane.
en.wikipedia.org Some herbivores have evolved ways to hijack plant defenses to their own benefit, by sequestering these chemicals and using them to protect themselves from predators.
en.wikipedia.org The historically important chemical class of tannins is a subset of the polyphenols.
en.wikipedia.org The team reported a noticeable stench of chemicals in the air.
en.wikipedia.org One example is in the design of chemical reactors.
en.wikipedia.org