Are they basic, such a light dimmer, or more imposing, like an alarm system or a video camera?

它们是基础部分（比如说调光器），还是稍高端点儿的（像警报系统或摄像头）？

youdao

Unlike other light sources, LEDs don't "burn out;" they simply get dimmer over time.

不像其他光源，LED灯不会“熄灭”；它们只会随着时间增长变暗。

youdao

Continuous variable between two opposite states, e. g., like a light dimmer switch.

处在两个对立状态之间的连续变量，比如，就像灯的调光器开关。

youdao

The iPhone was also a solid runner-up with this test -- it didn't perform as well in even dimmer light, as we experienced when capturing images from a dark rooftop late at night, but it did yield decent shots in the lab.

ENGADGET: From the lab: Lumia 920 low-light shootout with Nokia 808, iPhone 5, HTC One X and Galaxy S III

But it also carries a coronagraph to block the light from bright objects so it can see more easily nearby, dimmer targets - such as planets circling their stars.

BBC: Science & Environment

The dimmer has a unique multi-touch capacitive interface that allows the light to be turned on or off by sliding a finger up or down on the glass switch front.

ENGADGET: Ube WiFi Smart Dimmer to receive customized multitouch gesture control