launch 过去式:launched 过去分词:launched 现在进行时:launching 词形变化: 动词过去式: launched | 动词过去分词: launched | 动词现在分词: launching | 动词第三人称单数: launches | 词义辨析: 同义: vt.发起; 开始 start introduce spring set afloat set going embark on