答案和解析来啦：
Symmetry is everywhere in nature, and we usually associate it with beauty:
对称无处不在，我们常常认为对称是一种美：
a perfectly shaped leaf, or a butterfly with intricate patterns mirrored on each wing.
完全对称的一片树叶、或两只翅膀有着同样复杂花纹的蝴蝶。
But it turns out that asymmetry is pretty important, too,
但不对称也非常重要，
and more common than you might think,
而且比你想象的更加普遍，
from crabs with one giant pincer claw to snail species whose shells’ always coil in the same direction.
从只有一只大钳子的螃蟹到贝壳总是沿着同一方向盘圈的蜗牛。
Some species of beans only climb up their trellises clockwise,
某些豆科植物只会沿着棚架顺时针攀爬，
others, only counterclockwise,
而其它的只会逆时针攀爬，
and even though the human body looks pretty symmetrical on the outside,
并且，即使人体表面看起来十分对称，
it’s a different story on the inside.
身体内部却不是这样的。
Most of your vital organs are arranged asymmetrically.
多数重要器官在体里都是不对称的。
The heart, stomach, spleen, and pancreas lie towards the left.
心脏、胃、脾脏和胰腺的位置比较靠左。
The gallbladder and most of your liver are on the right.
而胆囊和大部分肝脏的位置靠右。
Even your lungs are different.
甚至肺也不是完全对称的。
The left one has two lobes, and the right one has three.
左肺有两片肺叶，而右肺有三片肺叶。
The two sides of your brain look similar, but function differently.
左右大脑看起来差不多，但功能不同。
Making sure this asymmetry is distributed the right way is critical.
身体的这种不对称分布也是非常重要的。
If all your internal organs are flipped, a condition called situs inversus, it’s often harmless.
如果身体内部构造完全反过来的话，即逆位，通常是无害的。
But incomplete reversals can be fatal, especially if the heart is involved.
但是不完全的逆位却是致命的，尤其是心脏的逆位。
解析在这里哦！
1. asymmetry，名词，表示“不对称”，比如：the asymmetry of Van de Velde’s designs of this period（这一时期范•德•费尔德设计作品的不对称性）。
2. coil，动词，表示“卷、盘绕”，比如：She coiled her hair at the back of her head.（她把头发盘在脑后。）
3. trellises，名词，单词原形为：trellis，表示“支撑攀缘植物的棚、架”。
4. pancreas，名词，表示“胰脏”。
5. gallbladder，名词，表示“胆囊”。
我们来看看常见的器官都怎么表达吧
