闪 shǎn describes the action of appearing suddenly.
电 diàn means electricity. Eg. 电脑 Computer, 电视 TV, 电话 phone
闪电：flash, lightning
新加坡作为一个热带国家，下雨是家常便饭，其中雷阵雨不在少数。
As a tropical country, Singapore experiences rainy weather very frequently, amongst which a lot are thunderstorms.
前几日新加坡连日下雨，23日的下午，一道闪电竟达到了女皇镇的一幢组屋楼，而这一幕又正好被人照下传到网上。
It has been raining every day recently. On the afternoon of the 23rd, a lightning struck a HDB block located at Queenstown, which was photographed and posted online.
据该组屋的居民称，闪电打下来的时候可以感到明显的窗口震动。
According to residents of the blood, they could clearly sense the window shuddering when the lightning struck.