moulting
[moʊltɪŋ]
v.
换羽，脱毛( moult的现在分词 );
去掉（旧习惯、观点等）;
例句:
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The rigid cuticle inhibits growth, so arthropods replace it periodically by moulting.
来自BBC
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They look a bit tatty because they are moulting.
来自BBC
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But I can't lie: the moulting is a problem.
来自THETIMES