单词题
allowed for = made possible
harsh = severe
duration of sea ice = length of time the ice lasts
annihilated = destroyed
exposed = unprotected
with no warning = without any indication beforehand
congestion = crowd
outbreak = sudden increase
accompany = occur along with
converge = come together
severity = seriousness
dense = thick
eased into = slowly entered
retain = keep
inevitable = certain
determinants = causes
hastened = rushed
diffusion = dispersal
perfected = completed
enables = allows
in some degree = To a certain extent
Obvious = clear
Adjacent to = next to
Widespread = common
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