decameter

例句：

1. 1. The painter painted a beautiful landscape in a decameter-long painting.
   画家在一幅长达十米的画作中绘制了一幅美丽的风景。
2. 2. The book is about the history of the United States, spanning over ten meters.
   这本书讲述了美国的历史，跨越了十米。
3. 3. The marathon is run over ten meters, and it takes around three hours to complete.
   马拉松赛跑的距离是十米，完成全程大约需要三个小时。