早期登陆火星的航天器都经过了彻底杀菌，但是当用于太空计划的资金变得紧张起来的时候，这种花费高昂的清洁程序就被削减了。
The early spacecraft that landed on Mars were thoroughly sterilized. But as money for the space program got tight, the expensive cleansing process was cut back.
早期登陆火星的航天器都经过了彻底杀菌，但是当用于太空计划的资金变得紧张起来的时候，这种花费高昂的清洁程序就被削减了。
The early spacecraft that landed on Mars were thoroughly sterilized. But as money for the space program got tight, the expensive cleansing process was cut back.
应用推荐