The light arrives at a low angle, however, as the Sun makes a daily circuit around the horizon, and icebergs cast long shadows over the surrounding sea ice.

然而，当太阳每天沿着着地平线转动时，阳光只能以很低的角度到达南极大陆，将这里的冰山制造出长长的影子，投射在周围的海冰之上。

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For example, one layer contains the active material that releases an electron when it's struck by light and another layer contains the circuit that carries the current.

例如，放置活化材料的一层，当它被光照时，便会释放电子，而电路层则负责传送电子流。

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An external circuit provides a path for the electrons to return to the p-type material, producing an electric current along the way that continues as long as light strikes the solar cell.

此时接上一条外线电路，电子便通过线路流动到p层。只要光束持续地撞击太阳能电池，就会有持续的电流。

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That wire can ground a contact on the circuit board behind the light that triggers a function intended to allow the door to be opened with a remote button, bypassing all its security measures.

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In this case, Richardson combined a couple of Arduino circuit boards with an infrared LED light -- that little red bubble on the front of your TV remote -- and programmed the whole thing to interact with a TV's closed-captioning system.

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Instead of using light to etch a transistor circuit on a wafer of silicon, they propose to fabricate tiny wires.

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