不常发生的的英文

• not happening often

• 不:    a block of wood
• 常:    ordinary; common; normal
• 发生:    happen; occur; take place; a ...
• 的:    4次方是 The fourth power of 2 i ...
• 经常发生的:    frequent; recurrent

例句与用法

1. In certain rare situations , however , forcing a collection might improve your application s performance . it might be appropriate to use the
   但是，在某些不常发生的情况下，强制回收可以提高应用程序的性能。