| 摘要 |
An air diffuser has a wood block with two end-grain faces at opposite ends and an elongated air chamber extending substantially parallel to and equidistant from the end-grain faces. Air under pressure is supplied to the air chamber. The air chamber is otherwise closed to cause air under pressure in the air chamber to travel through the wood block to the end-grain faces and diffuse into surrounding water when the diffuser is immersed therein.
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