ostium ['ɒstɪrm]

例句:

• At open-heart surgery...ostium primum and secundum defects were corrected.
  来自Journal of Pediatrics
• Is I does not want to open the ostium, aloofs.
  是我不想打开心门,拒人于千里之外.
  
• The key of surgery is to allow free drainage for sinus ostium.
  结论:使鼻道通气引流通畅是使之痊愈的关键.