Table 1 A deactivated word lexicon.

Specialised word

Coal mine, mine, undergroud, accident, etc.

Organization name

Emergency Department, Energy Department, Coal Industry Association, etc.

Place name

Shandong Province, Inner Mongolia Province, Shanxi Province, etc.

Preposition

By, according to, in in order to, etc.

Adverb

Must, too, very, extremely, etc.

Auxiliary word

the

Conjunction

With, and, then, because, etc.