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sporadically
Adverb
thỉnh thoảng, không đều đặn
at irregular and unpredictable intervals of time
"The clock 's alarm goes off sporadically, even when unset ."
sporadic
Adjective
thỉnh thoảng, không thường xuyên
occurring from time to time, in an irregular manner
"We experienced sporadic internet connectivity issues during the storm ."