<s>
Semantic	B-General_Concept
interpretation	I-General_Concept
is	O
an	O
important	O
component	O
in	O
dialog	B-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
It	O
is	O
related	O
to	O
natural	B-General_Concept
language	I-General_Concept
understanding	I-General_Concept
,	O
but	O
mostly	O
it	O
refers	O
to	O
the	O
last	O
stage	O
of	O
understanding	O
.	O
</s>
