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Scientists are not certain why the oxygen level dropped.
科学家们现在还不能断定为什么含氧量会下降。
youdao
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The degree of quenching correlates to the level of oxygen pressure.
淬灭度与氧压力水平相关联。
youdao
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The degree of quenching correlates to the level of oxygen pressure.
淬灭度与氧压力水平相关联。
youdao