scab over 结疤;愈合
The bumps go
through several stages before they get crusty, scab over,
and fall off.
小肿块经过几个阶段直到它们变硬,结痂和脱落。
As a blood clot on a surface injury dries out it forms a protective scab over the wound allowing new skin to grow underneath.
血块在伤口表面凝结之后在伤口上形成保护痂,新的皮肤在保护痂下生长。
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