bastionofiron铜墙铁壁
boilerwall;锅炉壁
cellwall细胞壁
aprecipitouscliff;precipice;峭壁
unscalablecliff绝壁
strengthenthedefencesandclearthefields;坚壁清野
watchthefightingfromtheramparts;beanonlooker作壁上观
(anindependent)sectionofacountry半壁江山
BiMing壁明
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