Calcium content increases gradually from outer zone to inner zone in dentin.

牙本质从外层到内层钙含量逐渐升高；

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The surplus heat in the inner zone in a building has become a problem not to be ignored in air conditioning designs.

建筑物内区余热已成为空调设计中不容忽视的问题。

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Velocity distribution can be expressed by a logarithmic formula for the inner zone and a parabolic formula for outer and surface zones.

底部内区流速分布可用对数公式表示；外区和表面区可用二次抛物线公式表示。

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As the idea has gained ground that the euro zone might form an EU inner circle, so Europe itself has come to seem more important to Poland.

ECONOMIST: The euro crisis is a threat to non-members too

Home Office officials have said in the event of an attack, the area immediately surrounding the scene, known as the "hot zone", would have an inner and outer cordon, with mobile shower units.

BBC: Warning over chemical attack 'cordon'

The East Side Gallery was created in 1990, when artists from around the world painted more than 100 works on the part of the inner wall that kept East Germans from crossing into the security zone.

WSJ: In Berlin, Wall Divides Developers, Protesters