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Idiom:
No spine 没有勇气，胆小鬼
Hit the book:
Towering
Penguin
Infectious
Immune system
Isolation
Pathogen
Simultaneously
For those who go, it's the trip of a lifetime – and it wouldn't be complete without a selfie with penguins. But growing tourism to the Antarctic, in combination with its warming climate, could be placing penguins at a risk of infectious disease
