specially skilled meaning in Chinese

绝活

Repair , remodeling and adjustment works must only be done by appropriately trained technicians or specially skilled personnel
有关缝纫机的修理、改造、调整应由受过专门训练的技术人员或专家来进行。
Exceptions to this are only adjustments and performance checks done by appropriately trained technicians or specially skilled personnel
但，受过相当训练的技术人员或专家进行有关调整或确认动作时除外。
Repair and maintenance works of electrical components shall be conducted by qualified electric technicians or under the audit and guidance of specially skilled personnel
有关缝纫机的电气方面的修理、维修应由有资格的电气技术人员或专家的监督和指导下进行。