以下为句子列表:
英文: Alloy steel heats are vacuum-treated on degassing units to reduce hydrogen contact to less than two parts per million and reduce metallic oxides.
中文: 合金钢热是在脱气装置下进行真空处理,以将氢接触减少到百万分之二以下,并减少金属氧化物。
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英文: Pre-solar grains are now estimated to make up a small part — only 100 parts per million — of the comet.
中文: 前太阳系颗粒估计填补了一小部分彗星成分——只有万分之一。
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