第一批钨丝电灯泡由所谓的加压的灯丝制成。
The first tungsten lamps contained so-called "pressed" filaments.
当电流通过电灯泡里的细钨丝时，会使钨丝很热。
Electricity that passed through the thin tungsten wire inside the bulb makes the wire very hot.
当电流通过电灯泡里的细钨丝时，会使钨丝很热。
Electricity that passed through the thin tungsten wire inside the bulb makes the wire very hot.
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