Just because your car is constructed of welded metal parts doesn't mean that you must be skilled with a welding torch to drive it.
虽然汽车是由金属部件焊接构成，但并不意味着你必须熟练掌握焊接技术才能开车。
All skilled welding and fitting was done by regular employees.
全部技术性的焊接和装配活都由正式工人担任。
It is well known that the welding processing on one hand requires on skilled operational skills, rich practical experience and stable level of welding;
众所周知，焊接加工一方面要求焊工要有熟练的操作技能、丰富的实践经验、稳定的焊接水平；
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