★英語聽力頻道為大家整理的初中英語聽力mp3下載帶原文：狗狗的嗅覺，供大家參考。更多閱讀請查看本站英語聽力頻道。
What Makes Dogs Such Great Sniffers?是什么讓狗狗擁有極好的嗅覺呢？
Watch a dog greeting the world with its nose, or following invisible trails of scent, and you might wonder what you’re missing. In one study, dogs were able to smell a particular test scent a thousand times better than humans! What makes dogs such stupendous sniffers?
當(dāng)看到一條狗用鼻子問候，或它正追尋著無形的味道時，或許想自己是不是丟了什么東西。一項研究發(fā)現(xiàn)，在聞某種特殊的氣味時，狗的嗅覺要比人類強(qiáng)上千倍。到底是什么使得狗成為驚人的嗅探器呢？
Smell Receptors
嗅覺接受器
Like humans, dogs have special smell receptor cells lining their noses. But dogs have about 20 times more of these cells than we do–and the differences don’t stop there!
像人類一樣，狗在鼻子旁邊有著特別的嗅覺接受器細(xì)胞。但狗擁有的嗅覺細(xì)胞是我們?nèi)祟惖?0多倍，且差別不止這些。
From the receptor cells, information about smell travels along nerves to the olfactory bulbs, the parts of the brain where information about smell is processed. Relative to the size of its brain, a dog’s olfactory bulbs are much bigger than most other animals. If the animal kingdom held a sniffing Olympics, dogs and rats would probably battle for the gold, leaving the rest of us in the dust.
嗅覺信息從這些接收器細(xì)胞沿著神經(jīng)被運輸?shù)叫崆?，大腦中關(guān)于氣味的信息在此處理。與動物的大腦尺寸相關(guān)，狗的嗅球比大多數(shù)其他動物要大的多。如果動物王國舉行一場嗅覺奧林匹克賽的話，狗和老鼠很可能為冠軍而戰(zhàn)，其它動物就望塵莫及了。
Tongue Transportation
舌頭傳輸
Another advantage dogs have is that the schnoz isn’t the only tool they use for smelling. When a dog licks your hand, or something less savory found in the street, its tongue transports molecules from that surface into its mouth. Just above the roof of the dog’s mouth is the vomeronasal organ, which gathers information on smell from the molecules the tongue delivers. Humans have vomeronasal organs, too, but compared to dogs, ours are very rudimentary.
狗的優(yōu)勢不僅在于它的鼻子。當(dāng)一條狗添你的手，或添地上的一些不怎么好吃的東西時，它的舌頭將水分子傳輸?shù)剿淖炖?。在狗嘴正上方的犁鼻器可用來收集關(guān)于舌頭傳過來的水分子的氣味。人類也有犁鼻器，但與狗相比，我們的還處于初級階段。
Although all dogs are stupendous sniffers, dogs bred for tracking such as beagles and bloodhounds are true professionals. There are also variations in individual dogs’ talents, and the dog’s diet and the type of scent all affect how well a dog can smell.
盡管所有的狗都是極好的嗅探器,在狗跟蹤方面，如米格魯獵犬和警犬是真正的專業(yè)人士。不同的狗也有不同的才能，狗的飲食和氣味的類型會影響狗的嗅覺。
What Makes Dogs Such Great Sniffers?是什么讓狗狗擁有極好的嗅覺呢？
Watch a dog greeting the world with its nose, or following invisible trails of scent, and you might wonder what you’re missing. In one study, dogs were able to smell a particular test scent a thousand times better than humans! What makes dogs such stupendous sniffers?
當(dāng)看到一條狗用鼻子問候，或它正追尋著無形的味道時，或許想自己是不是丟了什么東西。一項研究發(fā)現(xiàn)，在聞某種特殊的氣味時，狗的嗅覺要比人類強(qiáng)上千倍。到底是什么使得狗成為驚人的嗅探器呢？
Smell Receptors
嗅覺接受器
Like humans, dogs have special smell receptor cells lining their noses. But dogs have about 20 times more of these cells than we do–and the differences don’t stop there!
像人類一樣，狗在鼻子旁邊有著特別的嗅覺接受器細(xì)胞。但狗擁有的嗅覺細(xì)胞是我們?nèi)祟惖?0多倍，且差別不止這些。
From the receptor cells, information about smell travels along nerves to the olfactory bulbs, the parts of the brain where information about smell is processed. Relative to the size of its brain, a dog’s olfactory bulbs are much bigger than most other animals. If the animal kingdom held a sniffing Olympics, dogs and rats would probably battle for the gold, leaving the rest of us in the dust.
嗅覺信息從這些接收器細(xì)胞沿著神經(jīng)被運輸?shù)叫崆?，大腦中關(guān)于氣味的信息在此處理。與動物的大腦尺寸相關(guān)，狗的嗅球比大多數(shù)其他動物要大的多。如果動物王國舉行一場嗅覺奧林匹克賽的話，狗和老鼠很可能為冠軍而戰(zhàn)，其它動物就望塵莫及了。
Tongue Transportation
舌頭傳輸
Another advantage dogs have is that the schnoz isn’t the only tool they use for smelling. When a dog licks your hand, or something less savory found in the street, its tongue transports molecules from that surface into its mouth. Just above the roof of the dog’s mouth is the vomeronasal organ, which gathers information on smell from the molecules the tongue delivers. Humans have vomeronasal organs, too, but compared to dogs, ours are very rudimentary.
狗的優(yōu)勢不僅在于它的鼻子。當(dāng)一條狗添你的手，或添地上的一些不怎么好吃的東西時，它的舌頭將水分子傳輸?shù)剿淖炖?。在狗嘴正上方的犁鼻器可用來收集關(guān)于舌頭傳過來的水分子的氣味。人類也有犁鼻器，但與狗相比，我們的還處于初級階段。
Although all dogs are stupendous sniffers, dogs bred for tracking such as beagles and bloodhounds are true professionals. There are also variations in individual dogs’ talents, and the dog’s diet and the type of scent all affect how well a dog can smell.
盡管所有的狗都是極好的嗅探器,在狗跟蹤方面，如米格魯獵犬和警犬是真正的專業(yè)人士。不同的狗也有不同的才能，狗的飲食和氣味的類型會影響狗的嗅覺。