An incisor is one of the flat-edged teeth at the very front of your mouth. A human adult has eight of them: four on top and four on the bottom, sitting in the middle of the smile.

An incisor is one of the flat-edged teeth at the very front of your mouthincisor是你嘴巴最前面那種扁平邊緣的牙齒之一。A human adult has eight of them成年人有八顆：four on top and four on the bottom上面四顆、下面四顆，sitting in the middle of the smile就在笑容的正中間。

Their job is to bite off a piece of food — like a pair of small scissors — before the pointy canines and the big back molars take over.

Their job is to bite off a piece of food它們的工作是咬下一口食物——like a pair of small scissors就像一把小剪刀——before the pointy canines and the big back molars take over然後才輪到尖尖的犬齒和後面的大臼齒接手。

Children lose their first incisors quite young; those are the classic “tooth under the pillow” teeth. Animals have incisors too: a rabbit’s front teeth are famous incisors, and they keep growing, which is why rabbits must chew.

Children lose their first incisors quite young小孩很小的時候就會掉第一批incisor；those are the classic "tooth under the pillow" teeth那就是經典的「牙齒放枕頭下」的牙齒。Animals have incisors too動物也有incisor：a rabbit's front teeth are famous incisors兔子的門牙就是有名的incisor，and they keep growing, which is why rabbits must chew而且會一直長，這就是為什麼兔子必須一直咀嚼。

The word is the ordinary one in biology and at the dentist; at home most people just say “front teeth.”

The word is the ordinary one in biology and at the dentist這個字在生物學和看牙醫時是很普通的用詞；at home most people just say "front teeth."在家裡大家通常就直接說「前面的牙齒」。