The width of the reservoir illustrated here is approximately 8 kilometers (5 miles); a jet flying over the reservoir left a contrail midway between the shorelines.

图片中显示出的水库宽度大约为8千米（5英里），一架从上方飞过的飞机在水库两岸之间留下了一条航迹云。

youdao

Increase the compression degree can make arc of high temperature plasma jet extended, form more uniform high temperature area, and increase the speed of the jet, can reduce the width of the poor.

增加电弧的压缩程度可以使高温等离子射流延长，形成更为均匀的高温区域，同时加大射流的速度，可以减小切口上下的宽度差。

youdao

Due to the surface retardation, the attenuation rate of velocity becomes quicker, which depends on water depth and jet width.

由于水面的阻滞，中轴线上垂向速度的衰减较自由射流快，衰减规律随水深和射流宽度而异。

youdao