For example, the keyword "suggest" has been used in a speculative context in all its occurrences in the abstracts and in the full papers.
"appear" is a real speculation keyword in 86% of its occurrences in the abstracts and in 83% of its occurrences in the full papers, whereas "can" is a real speculation keyword in 12% of its occurrences in the abstracts and in 16% of its occurrences in the full papers.