Forced air circulation channel, ensuring the even temperature in the working chamber.

强迫式循环风道，确保工作室温度均匀。

youdao

Chamber-loading trace, rifling trace, chamber throat trace and bullet pulling brace are the four major bullet traces which formed on the bullet after its movement circulation.

进膛痕迹、线膛痕迹、坡膛痕迹、拔弹痕迹是弹头经枪械运动循环后，在弹头上形成的四种主要的弹头痕迹。

youdao

Alloy steel fan for air circulation and chamber temperature uniformity.

空气流通和室内温度均匀的合金钢风机。

youdao

Standing in the Grand Hammam excavation area, I could see the ruins of ancient chamber areas and air circulation passages that were slowly being restored.

BBC: An ancient Ottoman capital surfaces