Surface zone: surface zone is relatively constant and more radiopaque than the other zones.

表层：龋损区表面有一较为完整的表层，且较深层有更强放射阻射。

youdao

Earthquake activity is confined to a rather shallow surface zone along such belts of divergence.

地震活动就限制在沿着这种扩散带的较浅的表面地带上。

youdao

Details of any restrictions to the required scanning coverage and if applicable the extent of the near surface zone.

任何限制要求扫描覆盖面的具体细节，还有根据情况，近表面区域的范围。

youdao

One-year measurements of surface heat budget on the ablation zone of Antizana Glacier 15, Ecuadorian Andes.

UNESCO: Actividades y Productos del IRD en los Andes

But it concludes that the oil is continuing to break up and disperse underneath the surface, making the emergency of a major oxygen-poor dead zone unlikely.

CNN: No signs of 'dead zone' in Gulf, feds say

The reason: All four of the top American hopes possess serves and groundstrokes which are strong enough to be weapons on any surface, and the slow, high bounce on clay brings the ball into their hitting zone with sufficient time for them to set up their shots.

WSJ: Americans Produce Feats on Clay