In practice, however, we found that function in the canal is often diminished before surgery, and replacing the covering itself may lead to inactivation of the canal anyway.
然而在实践中，我们发现声道的功能早在手术前就没有了，更换表层本身可能会引发声道永久失衡。
2
IT professionals need not be all-knowing gurus to lead training sessions covering these programs.
IT专业人士不必成为一个无所不知大师才能进行这些培训。
3
This can lead to something called an epidural haematoma, where blood builds up between the outer covering of the brain and the skull, with consequent pressure on the brain itself.