Standard practice for enclosed carbon - arc exposure tests of paint and related coatings 使用封闭碳弧光灯曝露仪对涂料及有关涂层进行试验的标准实施规程
The arc lights were sputtering overhead , and high up were the lighted windows of the tall office buildings 弧光灯在头顶上方闪烁。更高处，写字楼的窗子里透出光明。
After switching on powerful arc lights , they saw great stalagmites - - some of them over forty feet high - - rising up like tree - trunks to meet the stalactites suspended from the roof 他们打开强力弧光灯，看见一株株巨大的石笋，有的高达40英尺，象树干似的向上长着，与洞顶悬挂下来的钟乳石相接。
