The sloped envelope indicates the development velocity of printing.
那个倾斜的信封呈现了印刷的成长速度。
2
The envelope of the beat frequency will always be stationary in space; no angular velocity.
信封的摆动频率将永远固定在空间;没有角速度。
3
These experimental results indicated that several factors such as gas velocity, electrode erosion, insulator envelope pollution and so on limited the repetitive operating capability of the switches.