壁垒森严壁壘森嚴

bì lěi sēn yán

Meaning

closely guarded; strongly fortified; sharply divided

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Characters

壁bìpartition, wall; rampart辟土垒lěirampart; base (in baseball)厽土森sēnforest; luxuriant vegetation木木木严yánstrict, rigorous, rigid; stern亚厂