Biochar is a type of charcoal produced by heating crop wastes, wood or other biomass in a simple kiln designed to limit the presence of oxygen.

生物炭是农作物废料、木材或其它生物质在简易窑(为限制氧存量而设计的窑)内经过加热而制成的一种炭。

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In surveying potential candidates for "new Earths," astronomers look for traces of biological activity, such as the presence of oxygen.

在可能成为“新地球”的调查对象中，天文学家搜寻生物活动的迹象，例如检查是不是有氧气。

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We investigated the influence (effect, impact) of temperature on the specific growth rat of yeast in the presence or absence of oxygen.

在有、无氧气存在的情况下，我们测定了培养温度对酵母比生长速率的影响。

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Finally, the whole sandwich is heated in the presence of oxygen, which combines with the precursor metals into fully fledged YBCO.

ECONOMIST: Inside story

To keep turbine sales spinning, Immelt has turned to a process that partially burns pulverized coal in the presence of pure oxygen to turn it into a flammable gas that can drive linked gas and steam turbines.

FORBES: On The Cover/Top Stories

Small flames were noted in one of the two incidents reported when gases escaping from the battery were ignited by an electrical short-circuit in the presence of ambient oxygen, but that was all external to the battery case.

FORBES: Boeing Completes Tests Leading To Resumption Of Dreamliner Operations