quaternary

英/ kwəˈtɜːn(ə)rɪ /

美/ kwəˈtɜːrnəri /

1
第四纪
...有的认为银河系中物质分布不均，太阳通过星际物质密度较大的地段时，降低了太阳的辐射能量而形成地球上的大冰期。 第四纪（Quaternary period）是地球历史的最新阶段，始于距今175万年。
2
四元的
... quassin 苦木素 quaternary 四级的；四元的；季 quick stop mutation 快停突变[大肠杆菌中升温至42即停止复制的突变] ...
3
四级的
... quassin 苦木素 quaternary 四级的；四元的；季 quick stop mutation 快停突变[大肠杆菌中升温至42即停止复制的突变] ...
4
第四系
...二叠系(Permian)、三叠系(Triassic)、侏罗系 (Jurassic)、白垩系（K Cretaceous）、第三系 (Tertiary)、第四系（Quaternary）。其中第四系（Q）是最新的地层，与人类关系最为密切。

短语

1
We know little of a quaternary compound.
我们对四元化合物了解得很少。
2
Review and prospects of Quaternary Glaciation research in China.
中国第四纪冰川研究的回顾与展望。
3
The Quaternary glaciation started just a few million years ago – and is still going on.
第四纪始于几百万年以前，并延续到现在。

Quaternary
The Quaternary Period /kwəˈtɜrnəri/ is the current and most recent of the three periods of the Cenozoic Era in the geologic time scale of the International Commission on Stratigraphy (ICS). It follows the Neogene Period and spans from 2.588 ± 0.005 million years ago to the present. The Quaternary Period is divided into two epochs: the Pleistocene (2.588 million years ago to 11.7 thousand years ago) and the Holocene (11.7 thousand years ago to today).The Quaternary period is typically defined by the cyclic growth and decay of continental ice sheets driven by Milankovitch cycles and the associated climate and environmental changes that occurred.

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