not darken sb.'s door

例句：

1. 1. The sun hasnot darkened the sky yet.
   太阳还没有使天空变暗。
2. 2. The room is toodark to read by.
   房间太暗，看不清。
3. 3. The painting was not darkened bythe smoke.
   这幅画没有被烟熏黑。