释放双眼，带上耳机，听听看~！
Index
Ø
Term
is <fieldName, text>
Ø
**index **
maps Term → <df, <docNum, <position>* >*>
Ø
e.g., “content:
pisa” → <2, <2, <14>>, <4, <2, 9>>>
Ø
New: term vectors!
Indexing Merge Diagram
