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(单词翻译)
Secrets of the plague
Vocabulary
rarely encountered
not often met or come into contact with
devastating
destructive and harmful
sparked
caused to start
fleas
tiny jumping insects which feed on the blood of animals and humans
fragments
small, incomplete pieces of
victims
people who had died of the disease
strains
versions of the disease
immune systems
our body's natural defence mechanism
adapted
changed and evolved to be able effectively to fight
pathogens
small organisms that cause diseases
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