Depending on how long a single piece of foil is utilized - in attempts to block the pulsing microwave energy - will determine how many lines are etched in the foil.

• 这取决于一个单张的金属箔被用了多久-在试图组织微波的脉冲能量-这将决定了有多少条线将被蚀刻在金属箔上。