light-tight tube

例句：

1. 1. The light-tight tube is used to keep the air inside the container dry.
   这个密封管用来保持容器内的空气干燥。
2. 2. The sealant was applied evenly around the seam of the pipe.
   密封剂被均匀地涂在管道的接缝上。
3. 3.The sealing tube prevents leaks and keeps the contents fresh.
   密封管防止泄漏并保持内容物的新鲜。