1. A planet would have to be a very long way from it to be capable of supporting life.
    那么一颗行星为了维持生命就要离开的它的恒星非常远。

2. Alternatively, if the star were small, the life-supporting planet would have to have a close orbit round it and also provide the perfect conditions for life forms to develop.
    反之，如果恒星很小，维持生命的行星就要在离恒星很近的轨道上运行，而且要有极好的条件才能使生命得以发展，

3. It was the idea of supporting a craft on a ´pad´, or cushion, of low-pressure air, ringed with a curtain of higher pressure air.
    他的设想是：用一个低压空气或软垫来支撑船体，软垫周围用高压空气环绕。