这座边境堡垒曾经固若金汤,如今只剩下被风沙侵蚀的城墙。Zhè zuò biānjìng bǎolěi céngjīng gùruòjīntāng, rújīn zhǐ shèngxià bèi fēngshā qīnshí de chéngqiáng.This border fortress was once impregnable, but now only walls eroded by wind and sand remain.
孩子们在沙滩上堆了一座小堡垒,还插上了一面旗子。Háizimen zài shātān shang duī le yí zuò xiǎo bǎolěi, hái chā shàng le yí miàn qízi.The children built a little fortress on the beach and stuck a flag on it.
这家老书店是小镇最后的文化堡垒。Zhè jiā lǎo shūdiàn shì xiǎozhèn zuìhòu de wénhuà bǎolěi.This old bookshop is the small town's last cultural stronghold.