内在联系internal relation
内六角扳手internal hexagonal wrench
托里定痛汤Internal Expulsion and Pain-Relieving Decoction
内吹乳痈internal blowing mammary welling-abscess
体内受精internal fertilization
内部裂纹internal crack【材】;underbead crack【材】
【物理】内部聚焦(内部聚焦)internal focusing (internal focussing)
尸体外表检验internal examination