zhòng​zhòngchóng​chóng

heavily

重重 zhòng​zhòng frequency
heavily adverb
In a heavy or severe manner
重重 chóng​chóng
layer upon layer adjective
One layer after another; describes something that is numerous or repeating, such as many difficulties or obstacles
echoing
describing sounds that are overlapping or echoing

Frequency

Movie subtitles
5.31 per million appears in 3% of films
Written text
12.1 per million

Sources