蛇每年都会蜕去旧皮。
Snakes ___slough their old skin every year.
螃蟹蜕壳后通常会躲起来直到新壳变硬。
Crabs often hide after they have ___sloughed their shells until the new ones harden.
伤口愈合时会自然脱落死组织。
The wound naturally ___sloughs dead tissue as it heals.
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