Scientists use "hole" as a metaphor for the area in which ozone concentrations drop below the historical threshold of 220 Dobson Units.
科学家们用“空洞”一词表示臭氧浓度低于220个多布森单位（多布森单位是用来度量大气中臭氧柱尺度的单位。
The hole isn't literal; no part of the stratosphere is empty of ozone. But scientists use the hole metaphor to describe the area where ozone drops below a historical concentration of 220 Dobson Units.
这里所谓的“空洞”不是字面上含义，并不存在任何一处平流层完全没有臭氧，科学家们用空洞这一说法来描述这些臭氧浓度低于历史读数220多布森单位的区域。
Two different worlds: Border guards stand in single file above, while below a West Berlin child smiles and points to a hole in the wall.
两个世界：上面边防兵站成一排，下面一个西柏林的孩子微笑着指着墙上的一个窟窿。
A small hole drilled in the filter intake just below water level will prevent accidental syphoning.
在滤器水位以下的入口上钻一个小洞就可以防止意外漏水。
Descending into the hole months later, in December 2009, a scientific team confirmed the new, naturally dry crystal cave about 500 feet (150 meters) below the surface.
数月之后的2009年12月，一个科考队深入了这个洞穴，他们确认这是一个新的自然风干形成的晶体洞穴，位于大约500英尺(150米)的地下。
Within a week or two the hole is filled with new asphalt that pushes up from below.
一两周内，洞又被地下涌出的沥青填满了。
The overall planning and design recommendations below are based on a facility that can service a three (3) golf course, 54-hole facility.
以下内容中提到的总体设计规划建议是基于美国一个54洞球场的场地部来提出的。
First string through the shoulder plate as shown in Figure c, then string through chest plates shoulder plate hole, tighten the knot below the armpit as shown in Figure d.
先把绳如图c所示穿过肩甲，再穿过胸甲的肩部孔，在腋下收紧打结。如图d所示。
As shown in the above and below drawings, this hole is located on the forward tube near the bottom extreme of the tube.
所示的上面和下面图，这个洞是位于管的管了极端的底部附近。
As shown in the above and below drawings, this hole is located on the forward tube near the bottom extreme of the tube.
所示的上面和下面图，这个洞是位于管的管了极端的底部附近。
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