而利用透镜和反光镜的辅助设备可使灯光强度倍增。
Refinements in lenses (e. g. , the Fresnel lens) and reflectors made it possible to substantially increase the light's intensity.
而利用透镜和反光镜的辅助设备可使灯光强度倍增。
Refinements in lenses (e. g. , the Fresnel lens) and reflectors made it possible to substantially increase the light's intensity.
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