A typical full-face air-purifying respirator, used here with a hood and suit for extra protection.
常见的全面罩过滤呼吸器，这里与提供更多保护头罩和防毒服配合使用。
2
The pump exhaust should lead to the open air or a fume hood.
抽气泵的排气管应该导向室外空旷处或导向一座通风橱。
3
Conduct the ignition in a well-ventilated hood, but protected from air currents, and at as low a temperature as is possible to effect the complete combustion of the carbon.