（一）未经批准，安装、使用电网的，或者安装、使用电网不符合安全规定的；
When a SpaceX rocket failure set the skies aflame over western Europe last February, no-one was sure if the debris was also polluting our atmosphere.
。业内人士推荐Line官方版本下载作为进阶阅读
但手感上的回归，往往需要付出一些代价。
// 测试用例（可直接运行验证）
[단독]폴란드, 韓 해군 최초 잠수함 ‘장보고함’ 무상 양도 안받기로