如果你在用有线的以太网，你需要检查一下看电缆周围的两个LED指示灯是不是都亮了。

If you're using wired Ethernet, you need to check that both LED indicators that surround the cable are lit.

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(韩国设计师，官网在此)设计的SEIL背包利用LED灯来显示交通信号。

SEIL backpack by Lee Myung Su USES LED lights to display traffic signals.

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最近几年，电力网供电的CFLs和LEDs的出现开始将他们转变成白炽灯的直属插件替代品。

In recent years the emergence of mains-powered CFLs and LEDs has started to turn them into direct plug-in replacements for incandescent bulbs.

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