The importance of collision course in guidance of homing missiles is elaborated, that is, the sufficient and necessary condition for a successful interception is the missile and target in the collision course.
阐述了碰撞过程在寻的制导中的重要意义,即实现拦截的充分必要条件是导弹与目标处于碰撞过程上。
参考来源 - 导弹变结构制导律研究So the gene mutation is the necessary condition of biology evolution.
从这个意义上说,DNA损伤亦是生物进化的必要条件。
参考来源 - DNA化学损伤机制的理论研究·2,447,543篇论文数据,部分数据来源于NoteExpress
One necessary condition seems to be a somewhat detached view of human problems.
一个必要的条件似乎是某种对人类难题超然客观的看法。
It's a necessary condition for many worthwhile things: child care, friendships, etc.
对于许多有价值的事情而言,如儿童看护和友谊等,它是必要的条件。
That is a necessary condition.
这是必要条件。
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