地球表面的弯曲度把微波的直线行程限制在48公里左右。
The curvature of the earth limits a microwave's line-of-sight path to about 48 km.
精密直线导轨系统，支持通过整个行程长度的负荷。
Precision linear rail system supports the load through the entire stroke length.
坚固的铝挤压支持通过整个行程长度的直线铁路系统。
Rugged aluminum extrusion supports the linear rail system through the entire stroke length.
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