black after white

例句：

1. 1. The painting isso black after white that it'shard to tell the colors apart.
   这幅画黑白分明，颜色难以分辨。
2. 2. After along day of work, I feel likeI'm black after white.
   工作了一整天后，我感觉筋疲力尽。
3. 3.The teacher explained the problem clearly, makingit easy to black after white.
   老师把问题解释得很清楚，让人容易理解。