笑声必然是智力发展最高程度的标志。
Laughing is an infallible sign of the highest degree of mental development.
该基岩标较以往监测标志有重大改进，并兼有高程控制与平面位置控制的作用。
The bedrock bench marks have made a significant improvement and play role in both of height controlling and plane location controlling.
采用对向测距三角高程联合二等水准进行标志的高程测量。
Subtending distance measurement trigonometric leveling uniting second-class leveling is adopted to measure height.
采用对向测距三角高程联合二等水准进行标志的高程测量。
Subtending distance measurement trigonometric leveling uniting second-class leveling is adopted to measure height.
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