1. Then, only add cover locations to static geometry as a fallback. 然后只在静态几何结构上增加掩蔽点作为后备。
2. Even if the primary objective is not attained, whether it is the sale or appointment, always has a fallback position. 即使最初的目的，不论是销售还是约会，没有达到，总有一个回旋的余地。
3. He said his organization would rather negotiate with the government than continue with litigation, which he described as a fallback position. 他说他的组织宁可与政府协商而不要继续诉讼，他把诉讼看作是退让的立场。
英英解释
n.
1. to break off a military action with an enemy
