hair canal

例句：

1. 1. The hair canal was filled with water, making it difficult to see through.
   头发管道里灌满了水，难以透过去。
2. 2. The doctor used a special tool to clean out the hair canal.
   医生使用一种特殊的工具清理了头发管道。
3. 3. The hair canal is responsible for transporting blood and other fluids from the scalp to the heart.
   头发管道负责将血液和其他液体从头皮输送到心脏。