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1.anaerobic conditions 缺氧条件
The use of sulfates and carbon dioxide requires strictly anaerobic conditions.
使用硫酸盐和二氧化碳时，需要严格的厌氧条件。
2. hydrogen sulfide硫化氢
The process by which hydrogen sulfide becomes sulfur is complex, and most often occurs when microbes, like bacteria, are present.
氢化硫转变为硫的过程十分复杂，通常是在有微生物（如细菌）存在的情况下才会发生。
3. drinking water 饮用水
he sensitivity of the test meets WHO standards for detecting the toxin in drinking water.
这种测试的灵敏度满足了世界卫生组织探测饮用水毒物的标准。
