rail 名词复数:rails 过去式:railed 过去分词:railed 现在进行时:railing 词形变化: 名词: railer | 动词过去式: railed | 动词过去分词: railed | 动词现在分词: railing | 动词第三人称单数: rails | 词义辨析: 同义: n.横杆, 铁路 horizontal bar log rail railway track n.栏杆 railing fence