1. The sky darkled at the approaching storm.
   风暴来临前天空渐渐暗了下来。
2. The night darkles rapidly.
   夜很快地黑暗下来。
3. The precipice darkles in front.
   山崖的前面是阴暗的。
4. 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。

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