ensure 过去式:ensured 过去分词:ensured 现在进行时:ensuring 词形变化: 动词过去式: ensured | 动词过去分词: ensured | 动词现在分词: ensuring | 动词第三人称单数: ensures | 词义辨析: 同义: vt.保证; 确保 assure guarantee make certain vt.保护 protect guard defend shelter cover shield screen