subsonic 词形变化: 名词: subsoiler | 动词过去式: subsoiled | 动词过去分词: subsoiled | 动词现在分词: subsoiling | 动词第三人称单数: subsoils | 同义词: 反义词: sonic | supersonic | 词义辨析: 反义: a.次音速的 supersonic