The moon vehicle system was based on a modular design. One advantage of such a design – that failure in one component is less likely to compromise the whole – was demonstrated on the Apollo 13 mission. The astronauts were brought back safely to earth despite an explosion that damaged systems on the principal craft. Any engineer will tell you of the importance of making complex systems robust. You need inspections to prevent failure, to be sure: but since failures are inevitable it is equally important to try to ensure that the consequences of such failure are contained.
月球车系统建立在模块设计的基础之上。此类设计的一个好处是，一个部件的故障不太可能影响到整体，这一点在阿波罗13号登月任务中得到了体现。尽管一场爆炸破坏了主舱中的系统，但宇航员仍被安全带回了地球。任何一位工程师都会告诉你，把复杂系统做得坚固非常重要。诚然，你需要进行检查系统以防止故障的发生，但既然故障不可避免，那么确保这类故障后果可控也同样重要。
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