He's the one who found the weak spot on the installation.
他是发现在安装上的弱点那一个。
When the spot condition is mature, we will carry on the spot installation and debug of the control system.
当现场条件成熟时，就要进行控制系统的现场安装与调试工作。
On-the-spot experiments proves steady operation and easy installation and clear sound prompt of the device which can offer great convenience to the blind pedestrians.
应用表明：该交通信号声讯器安装简单，工作稳定，声讯提示清晰，为有视觉障碍的行人横过马路提供了极大方便。
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