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Don't just use machine translate, Shiratsuyu is saying "Di molto!" not "The molt!", the latter doesn't even make sense.

陥没 ("subsidence", more generally a depression or recess) is probably a euphemism for inverted nipples. 沈頭鋲 is a little strange, though. It appears to be a construction/manufacturing term, meaning "flush rivets", applying it to nipples seems novel or at least unusual.