She says the boatwould be shaped like a capsule, powered by a small nuclear engine, and thoughthere would be no sail, it would have a mast to hold a camera.
这里的第二小句and though是什么使用方法呢？为何第三小句的句首没连接词and等呢？
①She says the boat would be shaped like a capsule, powered by a smallnuclear engine, and ②though there would be no sail, it would have a mast to hold a camera.
and连接的是①和②。其中的②后面也是一个复合句：it would have amast to hold a camera是主句，though there would be nosail是让步状语从句。第三小句的句首不可以再用连接词and。