One difficulty with direct methods is that the designer spends a great deal of time focusing on the velocity distribution; the geometry is secondary.
一个直接的方法就是难度设计者花费大量的时间专注于速度分布；几何为辅。
By focusing on ecific certification areas, secondary teachers ecialize in the subjects they want to teach.
中学教师只要在其喜欢的领域取得了相关的证书，就可以教他们想教的课程了。
By focusing on ecific certification areas, secondary teachers ecialize in the subjects they want to teach.
中学教师只要在其喜欢的领域取得了相关的证书，就可以教他们想教的课程了。
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