Even in the latter case the line is only elliptical, a form of movement natural to the human body because of the joints, so this hardly demands any great skill from the operator.
即便在后一种情况下，线路也只是椭圆形的，一种对人体来说自然——因为关节——的形式，因此这很难说会对操作者有多高的技艺要求。
"Critical lifts" can be defined as those lifts that are out of the ordinary or may approach the limitations of the lifting equipment or skill level of the operator.
“关键吊装”可以定义为那些超常规的、可能接近起重设备上限或操作员能力水平的吊装。
The system can evaluate the effect of training, and make an objective evaluation for the skill of the operator.
系统具有训练效果评估功能，可对操作手的操作技能的高低作出客观的评价。
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