O-mode waves launched from all of the three positions can propagate ideally by properly adjust the launch conditions.
寻常波从强场侧、弱场侧和顶部发射时，通过适当的调整波的发射条件，也能得到理想的传播结果。
The type blockio sets the disk to direct block I/O mode without page cache.
类型 blockio 把这个磁盘设置为直接块 I/O 模式，没有页面缓存。
To be more selective, you may prefix the mode expression with u to set the permission for users, g to set it for groups, and o to set it for others.
为了更具可选性，您可以给模式描述加前缀 u 来设置用户权限，g 来设置组权限，还有 o 为其他人设置。
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