1.In hindsight, the decision to make Point mutable turned out to be costly to program clarity and performance.
依后见之明，使Point成为可变的这个决定被证明对于程序清晰性和性能是昂贵的代价。
2.The balls make point contact with the raceways (elliptical contact when loaded).
使点的球与滚道接触（椭圆接触时加载）。
3.Windows XP introduced a technology called Volume Shadow Copy to make point-in-time snapshots of disk volumes.
WindowsXP引入了一种称为卷影复制的技术，可生成磁盘卷的时间点快照。