Under an overcast sky, cranes and flatbed trucks hauled mangled cars away.

今天乌云密布，工作人员利用吊车和平板卡车将变形的火车厢拖走。

In the second half of the week, we will see overcast skies with scattered thunderstorms.

下半周，我们将看到阴天，有零星雷雨。

With no moon in sight and an overcast sky, the walk back home was melancholy.

天空阴沉沉的，看不到月亮，我在回家的路上郁郁寡欢。

By a bench that overlooks the city, I happened upon a moss-covered log that glistened green under the overcast sky.

在一条可以俯瞰城市的长椅旁，我偶然发现了一根长满青苔的圆木，在阴沉的天光里绿得发亮。

With overcast skies and temperatures in the 40's, President Trump declared it perfect weather for the annual White House Easter egg roll.

虽然天气阴沉，气温只有40℉左右，特朗普总统仍宣布这个天气正适合白宫复活节滚彩蛋活动。

For instance, stratus clouds-those unlovable, featureless sprawls that give us our overcast skies, happen when moisture-bearing updrafts lack the oomph to break through a level of more stable air above, and instead spread out, like smoke hitting a ceiling.

比如，要是携带水汽的上升气流无法突破上面比较稳定的一层空气，就会像烟碰到了天花板那样向外展开，于是就形成了层云一那种不大讨人喜欢，毫无特色，弄得天空阴沉沉的云层。