Latham made another attempt a week later and got within half a mile of Dover, but he was unlucky again. His engine failed and he landed on the sea for the second time.

　　16.Latham made another attempt a week later and got within half a mile of Dover, but he was unlucky again.

　　莱瑟姆一周以后也作了一次尝试，飞到离多佛不到半英里的地方。这次他又遭厄运。

　　语言点:within强调距离很短，作者用个介词间接说明了莱瑟姆的尝试最后以失败告终这一结果。

　　17.His engine failed and he landed on the sea for the second time.

　　因引擎故障第二次降落在海面上。

　　语言点:句子结构分析:and连接两个并列的分句。For the second time说明是第二次失败。