“/”小停顿  “//”大停顿   bold 加重语气

Have you ever picture a world without light?// Just think how much we rely on依靠 manmade人造的 light sources光源 in our lives,/ without engineers,/ we wouldn’t be able to live the way we do.// No streetlights,/ no TV,/ no computer displays显示,/ no house light,/ engineers design and build all these things.