n.[医]孕腹轻松（指怀孕末期子宫降至盆腔所致的感觉）
v.照亮，闪出，闪电，减轻（动词lighten的现在分词形式）
Lightening is usually accompanied by thunder. 闪电总与雷鸣相伴。
Heavy rain came on the heels of the lightening. 大雨紧跟着闪电而来。
