The gum collar dips downwards on the inner and outer surface of each tooth but rises between the teeth.

口香糖衣领倾角向下就内，外表面的每一个齿，但上升之间的牙齿。

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Conclusion Tear strains were formed by inner and outer surface bone cortex in the anterior inferior part of acetabular notch.

结论构成泪痕的结构为髋臼窝前下方处的内、外骨皮质影。

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The results indicated that there is a great difference between the temperatures in inner and outer surface of cylinder head. The starting ope…

实测结果表明：汽缸盖内、外表面的温度变化规律有很大差别，启动工况对热负荷可靠性影响最大。

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The UCL team discovered that MIP-1a plays a key role in the early stages of an allergic response within the clear membrane that coats the inner surface of the eyelid and outer surface of the eye, known as the conjunctiva.

BBC: NEWS | Health | Eyelid protein is key to allergy