The term means that there is a partial obstruction in the air stream.

这个名词的意思是指气流有一部分阻碍。

To be clear, fricatives mean there is a partial obstruction in the air stream.

清楚地说，摩擦音指的是气流有一部分被阻滞。

It can be a full or partial obstruction of the air, for example.

例如，可以是完全阻滞或部分阻滞。

In some cases of partial obstruction however, the loss of blood supply may be sufficient to progress to infarction in a limited region of the ischemic area.

然而，在部分梗阻的一些病例中，供血不足可能足以在缺血区的有限区域发展成梗死。