the defence is iron-clad.; sharply divided; strong defence, preparations; strongly fortified; the demarcation between each other is distinctly marked
Related Translations:
森严: severe; stern; strict 短语和例子壁垒森严 strongly fortified; 戒备森严 heavily guarded; 门禁森严 with the entrance carefully guarded; 等级森严 be rigidly stratified; form a strict hierarchy
门禁森严: the gate is strictly guarded.; with the entrance carefully [heavily] guarded