The sky darkled at the approaching storm. 风暴来临前天空渐渐暗了下来。
The night darkles rapidly. 夜很快地黑暗下来。
The precipice darkles in front. 山崖的前面是阴暗的。
If the silvered jewelry do not keep in a sealed environment or wipe it oftenly, it will caused the the color and luster become darkle. 银饰若未密封保存或经常擦拭,易使色泽变暗。