bulwark 名词复数:bulwarks 过去式:bulwarked 过去分词:bulwarked 现在进行时:bulwarking 词形变化: 动词过去式: bulwarked | 动词过去分词: bulwarked | 动词现在分词: bulwarking | 动词第三人称单数: bulwarks | 词义辨析: 同义参见: defense jetty security safeguard entrenchment protection dike