n.凝固物；固结物，凝块，凝固；固结，固结的程度；凝结度，具体（化）

The sediment accumulated and formed concretions over millions of years.
数百万年来，沉积物积累并形成了结核。
Concretions are often found in sedimentary rocks, where they form around a nucleus.
结核通常在沉积岩中被发现，它们围绕一个核心形成。
The process of concretion formation can provide clues about the environment in which the rock formed.
结核形成的过程可以为岩石形成时的环境提供线索。
Ironstone concretions are common in some sedimentary layers and can be used as an indicator of paleoenvironmental conditions.
铁质结核在某些沉积层中很常见，可以作为古环境条件的指示器。
The concretions that form in the stomach of some animals are called gastroliths, which may help in digestion.
在某些动物胃中形成的结核被称为胃石，可能有助于消化。
The analysis of concretions can give insights into the history of sedimentation and diagenesis in a particular area.
对结核的分析可以深入了解特定区域的沉积和成岩作用历史。
In some cases, concretions can contain fossils, providing valuable information about past life forms.
在某些情况下，结核可能包含化石，提供了关于过去生命形式的宝贵信息。
The size and shape of concretions can vary widely, depending on the conditions under which they formed.
结核的大小和形状可能因形成条件而有很大差异。
Concretions can form in various environments, including marine, freshwater, and terrestrial settings.
结核可以在各种环境中形成，包括海洋、淡水和陆地环境。
The study of concretions is important for understanding the processes that occur during the transition from loose sediment to solid rock.
研究结核对于理解从松散沉积物到固体岩石过渡过程中发生的现象至关重要。