The middle zone is the safe zone.

中间的区域是安全区。

And I'll try to keep my " bad" cholesterol low and " good" cholesterol in that happy middle zone.

我将努力让我的 " 坏" 胆固醇保持低水平，让" 好" 胆固醇待在那个幸福的中间区域。

In the lower and middle zones a few fall a prey to rattlesnakes.

在下部和中部地区， 有一些成为响尾蛇的猎物。

Zona fasciculata is the middle zone and also the widest zone and it takes up the majority of the volume of the whole adrenal gland.

束状带是中间那层，也是最宽的一层，占了整个肾上腺大部分的体积。

In the lower and middle zones, where they all meet, they are tolerably harmonious-a happy family, though very amusing skirmishes may occasionally be witnessed.

在他们相遇的下层和中层区域， 他们还算和谐——一个幸福的家庭， 尽管偶尔会发生非常有趣的小冲突。

But it is only in the lower and middle zones that the meeting of winds and woods is to be seen in all its grandeur.

但只有在中低地带才能看到风与树林交汇的壮丽景色。