年紀變大更有智慧
As babies, we’re all born without any teeth showing.
當我們出生時，口中還沒長出任何牙齒。
cut a tooth長出新牙
However, all the teeth we will ever grow are stored in our skulls at that time; we just can’t see them until they come in.
不過，我們以後長出的所有牙齒都儲存在我們的頭骨中；只是在長出來之前我們看不到而已。
store(v.)儲存store sth. away把～收好=store sth. upskull (n.)頭顱、頭骨a fractured skull破裂的頭骨get sth. into one’s thick skull很難理解When will he get it into his thick skull that I’ve never wanted to see him again?那個笨頭笨腦的傢伙什麼時候才明白我再也不想見他
As children, we grow 20 baby teeth.
童年時期我們會長出20顆乳牙。
baby teeth乳牙
When these fall out, our 32 adult teeth come in.
當這些乳牙脫落後，我們的32顆恆齒就會長出來。
adult teeth恆齒front teeth門牙=incisorback teeth臼齒=molar
In addition, some of us will grow up to four extra teeth called wisdom teeth in the far back of our mouths.
此外，我們之中的一些人還會長出四顆額外的牙齒，叫做智齒，長在我們口腔的最裡面。
extra(adj.)額外的
These special teeth are called wisdom teeth because they can show up when we’re “older and wiser” — usually between the ages of 17 and 21.
這些特別的牙齒被稱為智齒，是因為它們可能會在我們「年紀變大且更有智慧」時出現——通常在17至21歲之間。
show up出現=appear(v.)stand sb. up放～的鴿子wise(adj.)有智慧的
They are our third set of molars, which are flatter teeth that help us chew the food we eat.
它們是我們的第三組臼齒，是比較扁平的牙齒，可以幫助我們咀嚼食物。
flat(adj.)平的、氣水沒氣的The soda was warm and had gone flat.這汽水溫溫的已經沒有氣了chew(v.)咀嚼swallow(v.)吞嚥chew the fat閒聊bite off more than you can chew不自量力
Not all of us have our wisdom teeth come in though. This is because modern humans don’t need them to chew our food.
不過並不是所有人都會長智齒，這是因為現代人並不需要智齒來咀嚼食物。
boil down to sth.歸結為
According to one study, only 53% of adults have at least one wisdom tooth showing, and men are more likely than women to have this happen.
根據一項研究，只有53%的成年人至少會長出一顆智齒，而且男性比女性更有可能長出智齒。
be likely to do something可能會發生It’s likely to rain this afternoon.今天下午很有可能會下雨
However, even if we can’t see our wisdom teeth, they can cause health problems.
然而，即使我們看不見智齒，它們也會造成健康問題。
even if即使cause(v.)造成=bring about=lead to=result in
Because modern humans have smaller jaws, our wisdom teeth may not fit in our mouths correctly.
由於現代人的下巴較小，我們的智齒可能無法適當地容納在我們的口腔中。
jaw(n.)下巴jaw-dropping(adj.)令人瞠目結舌的jaw-droppingly beautiful美的令人驚艷
This means that whether they come in or not, wisdom teeth can become infected and may need to be removed.
這意味著無論它們是否長出來，智齒都可能感染並需要拔除。
whether ... or not 是否infect(v.)感染be infected with被～感染infect sb.with sth.使某人感染～某種情感She infected the children with her enthusiasm for music.她把她對音樂的熱愛感染給孩子們remove(v.)移除remove A from B把A從B中移除It’s difficult to remove the stain from the clothes.要把這個污漬從衣服移除有困難have a tooth out拔牙