Supply LED light source, digital point light source, LED lights, box lights.

供应LED点光源，数码点光源，LED灯，方块灯。

youdao

Consider first a light wave spreading out from a point source.

点光源一个好的例子是你家里的电灯泡。

youdao

Consider first a light wave spreading out from a point source.

点光源一个好的例子是你家里的电灯泡。

youdao