If oil got into the production pipe from the bottom, then barriers that would have impeded its flow up the cavity around that pipe would have made little difference.
Inversions can help clear the upper respiratory tract and drain secretions from the nose, allowing freshly oxygenated blood to flow into the oral cavity.
倒置体式能清理上呼吸道，排出鼻腔内的分泌物，让新鲜富氧的血液循环到口腔。
3
They are the cavity radiometer and the water flow power meter for laser power measurement, the cone calorimeter and the volume-absorbing calorimeter for laser energy measurement.