1、If this is not helpful, a full-face mask may be considered.
如果這不是有益的，一個完整的面罩可以考慮。

2、A typical full-face air-purifying respirator, used here with a hood and suit for extra protection.
常見的全面罩過濾呼吸器，這里與提供更多保護頭罩和防毒服配合使用。

3、Why should you wear a full-face helmet
為什麼你應該穿戴一頂全罩式的安全帽？