1\An impacted wisdom tooth is one that fails to completely rise through the gums -- the term is erupt.the term is erupt.2\Experts say people should have their mouths examined between the ages of sixteen and twenty for placement of their wisdom teeth.

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1\An impacted wisdom tooth is one that fails to completely rise through the gums -- the term is erupt.the term is erupt.2\Experts say people should have their mouths examined between the ages of sixteen and twenty for placement of their wisdom teeth.
1\
An impacted wisdom tooth is one that fails to completely rise through the gums -- the term is erupt.
the term is erupt.
2\
Experts say people should have their mouths examined between the ages of sixteen and twenty for placement of their wisdom teeth.
for placement of their wisdom teeth.在句中充当状语对吗?
3\
Scientists say the diet of prehistoric humans probably required more chewing teeth.Life was probably a little rougher on the teeth back then,too.So it was good to have extras.
Life was probably a little rougher on the teeth back then,too.
So it was good to have extras.to have extras 在句中充当什么成份?
4\
After surgery,there can be swelling of the gums and face and some pain.
there can be 这是个什么句型呀,从没见过?

1\An impacted wisdom tooth is one that fails to completely rise through the gums -- the term is erupt.the term is erupt.2\Experts say people should have their mouths examined between the ages of sixteen and twenty for placement of their wisdom teeth.
1the term is erupt相当于这期间长牙.整句是,智齿就是在长牙的时候没长全,后期才开始长的牙齿.
2 是目的状语.
3 只靠后排的牙齿来咀嚼可能有点困难.be good to do sth 是固定成分,这句是,所以多长几颗牙还是好的.
4 就是there be 的句型,加can是加强语气,就是肯定的意思.整句就是,手术后,牙龈和脸肯定会肿胀,也会有点痛.

1、the term is erupt. 的意思是“术语叫做长牙”。
2、for placement of their wisdom teeth是作目的状语。
3、So it was good to have extras. to have extras 在句中充当句子的真正主语。这个句子中it是形式主语。
4、there can be 的意思是“有可能会。。。。。。”。...

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there can be = there be 有