The chemical composition of rainfall changes slightly as raid clouds move.

当雨云移动时，降雨的化学成分略有变化。

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The chemical composition of rainfall changes slightly as rain clouds move.

降雨的化学成分随着雨云的移动而发生轻微变化。

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Scientists had information about the shape of the domes but not about their chemical composition and origins.

科学家们掌握了关于圆顶形状的信息，但不清楚它们的化学成分和起源相关的信息。

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In the time it takes for one cell division to occur, it could be that this cell entraps a different chemical composition of the cytoplasm then this entraps, and that's a well known concept.

当一个细胞分裂发生期间,很可能这个细胞截留了一种不同的,细胞质化学组分,这种非对称分裂是一个广为人知的概念

耶鲁公开课 - 生物医学工程探索课程节选

Rover scientists waited for data from rover instruments that measure the chemical composition of rocks.

NPR: Mars Rover Marks Second Anniversary of Landing

This is to make comprehensive maps of the moon's chemical composition, magnetism and gravity.

ECONOMIST: Divining water

Can astronomers deduce, from the chemical composition of the leftover stars, how big it was?

ECONOMIST: Stellar origins