diameter of stack openning

例句：

1. 1. The engineer measured the diameter of the stack opening to ensure it was within the required specifications.
   工程师测量了堆栈开口的直径，以确保它符合所需的规格。
2. 2. The manufacturer claims that their product has a diameter of stack opening of 50 mm, which is significantly larger than other competitors.
   制造商声称他们的产品堆栈开口直径为50毫米，这比其他竞争对手显著更大。
3. 3. Due to its large diameter of stack opening, this type of machine can handle heavier loads and operatemore efficiently.
   由于其较大的堆栈开口直径，这种机器能够处理更重的负载并更高效地运行。