ResearchintoXhasalonghistory.
Formanyyears,thisphenomenonwassurprisinglyneglected忽略by…
OnlyinthepasttenyearshavestudiesofXdirectlyaddressedhow…
PriortotheworkofSmith(),theroleofXwaslargelyunknown.
Overthepastdecade,mostresearchinXhasemphasisedtheuseof...
Inrecentyears,therehasbeenanincreasingamountofliteratureon...
EarlyexamplesofresearchintoXinclude…(Smith,;Jones,).
Duringthepast30years,muchmoreinformationhasbe