Solution: Verify whether or not the DISPLAY environment variable is pointing to the running Xserver.
解决方案：验证DISPLAY环境变量是否指向正在运行的Xserver。
A variable crawler - type mobile robot was developed, and the running experiment was conducted.
研制开发了一种可变履带式移动机器人，对其进行了行走试验。
You can change a variable to refer to other objects while your code is running.
您可以在程式码执行时将变数变改为参考其他物件。
The analysis is made combining with the real running situation of variable-section mill.
文中还结合变截面轧机实际运行情况进行了分析。
The analysis is made combining with the real running situation of variable-section mill.
文中还结合变截面轧机实际运行情况进行了分析。
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