所以氧气并不能在空气中堆积很长时间，因为它被易氧化的石头吸收了。
The oxygen did not build up in the atmosphere for a long time, since it was absorbed by rocks that could be easily oxidized (rusted).
针对钛材焊接时易氧化的特点，提出了相应的保护措施，实际应用取得了较好的效果。
In accordance to the performance of titanium material being easy to oxidize during weld, the corresponding protection was proposed. The fairly good effect was obtained in the actual application.
在环氧化反应中，利用价廉、易制备的过氧甲酸以几乎定量的收率得到了环氧化合物。
The use of performic acid, an affordable and easily prepared reagent, in epoxidation led to quantitatively the target epoxide.
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