英语语法分析

The frame of an airship is made of light but strong metal.

飞船的框架是用轻而坚固的金属制成的。

《新英汉大辞典》

The airship circled at sea.

飞艇在海面打圈子。

《新英汉大辞典》

This approach gives the gases more room to expand without stretching the envelope of the airship too much.

这种方法为膨胀的气体提供了更大的空间，因此无需过多地加长飞船的气囊。