By night, the perimeter wire was illumined by lights.是什么意思？

By night, the perimeter wire was illumined by lights.

到了夜里,周遭的铁丝网都被灯光照亮。

by

prep. 在…旁边，表示方式，由于，经过；adv. 经过，表示保留或保存时用，短暂拜访；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

night

n. 夜，晚上，（举行盛事的）夜晚；

例句
Video cameras with night vision can be activated by movement.
带夜视镜的摄像机一有动静就会启动。

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

perimeter

n. <数>周长，周围，边

例句
By night, the perimeter wire was illumined by lights.
到了夜里,周遭的铁丝网都被灯光照亮。

wire

n. 金属丝，电线，电报，（木偶的）牵线，操纵绳，背后操纵的势力，秘密引线，秘密策略；vi. 拍电报；vt. 拍电报，给…装电线；

例句
Whisk the batter with a wire whisk or hand beater until it is smooth and light.
用搅打器或手动搅拌器将面糊搅打均匀暄软。

was

v. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去式 ），在，存在，不受干扰；

例句
There was a terrible sadness in her eyes...
她眼神中流露出深深的悲伤。

illumined

v. 照亮，照明( illumine的过去式和过去分词 )，启发，粲；

例句
By night, the perimeter wire was illumined by lights.
到了夜里,周遭的铁丝网都被灯光照亮。

lights

n. （供食用的）家畜的肺脏，光( light的名词复数 )，火柴，光源，[宗教]灵光；v. 点火( light的第三人称单数 )，（使）容光焕发，（使）发光，（使）发亮；

例句
Cars did not stop when the lights were on amber.
交通灯变成橙黄色时，汽车没有停下来。