核磁共振（NMR）是天然产物化学研究的重要手段。
NMR has played an important role in Natural Product Chemistry.
此外，这些非天然产物化学品进入你的头发可以和孔堵塞。
In addition, these un-natural hair product chemicals get into your pores and can plug.
此外，这些非天然产物化学品进入你的头发可以和孔堵塞。
In addition, these un-natural hair product chemicals get into your pores and can plug.
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