No air bubbles were present in the green ice, suggesting that the ice was not formed from the compression of snow but instead from the freezing of seawater.

绿色冰层中不含气泡，这表明了这种冰层是由冻结的海水形成的，而不是凝结压紧的积雪。

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Such ice cores trap gases, bits of dust, and other chemicals that were present in the snow that fell over Greenland for thousands of years and then became compressed into ice.

这些冰芯将气体、尘埃和其他化学物质封存在格陵兰岛数千年来的积雪中，然后被压缩成冰。

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There was no microbody in the generative cell but many microbodies were present in the tube cell cytoplasm.

生殖细胞内不具微体，而管细胞的细胞质有较多的微体。

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The damaged areas were present when Howard Carter discovered King Tut's tomb in nineteen twenty-two.

VOA: special.2009.12.15

If you looked at the antibodies that were present in the blood, for example, you would find that most of those antibodies are IgM during this initial period of antibody concentration rise.

如果你现在观察血液中存在的抗体,举个例子,在初次免疫的抗体浓度上升阶段,你将会发现大部分的抗体都是IgM

耶鲁公开课 - 生物医学工程探索课程节选

And you'll use "If I were" to talk about yourself in the present in relationship to the past.

你可以用“If I were”来比较现在的你和过去的你。

If I were 课堂 - SpeakingMax英语口语达人

Western and international observer groups were present in Romania during the voting on 20 May 1990.

CENTERFORSECURITYPOLICY: Center for Security Policy | Not Free, Not Fair: An Assessment Of The 20 May 1990 Elections In Romania

"Everything we know that they were present in has been targeted, " he told the AP.

NPR: Lebanon Attacks Militants in Refugee Camp

It can be assumed that Iranian personnel were present in North Korea during Monday's test.

CENTERFORSECURITYPOLICY: Israel and the Axis of Evil