It is very useful for translating technical documents as these texts have fixed structures and many terms.

它对翻译技术文件非常有用，因为这些文本有固定的结构和许多术语。

But using a fixed structure to send smaller payloads of astronauts and equipment into orbit would be safer, easier, and cheaper than conventional rockets.

但使用固定的建筑将较小的负载量——包含太空人和设备——送上轨道，比传统火箭更安全、更简单也更便宜。