Riggers and signal persons also need standard training and testing to ensure safety under the hook.
装配工人和发信号的人也需要标准的培训和测试，以确保安全下钩。
How is it then that uncertified and untrained people are allowed to signal and rig under the hook of a licensed or certified operator?
怎么能允许那么无证和未受过训练的人来代替有工作证或经核证的操作者呢？
How is it then that uncertified and untrained people are allowed to signal and rig under the hook of a licensed or certified operator?
怎么能允许那么无证和未受过训练的人来代替有工作证或经核证的操作者呢？
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