[The researchers] noticed many of their pieces of [plastic marine] debris sported surface pits around two microns across. Such pits are about the size of a bacterial cell. Closer examination showed that some of these pits did, indeed, contain bacteria, […].

Google Translation / DeepL Translation

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Sense（2）

Particularly, an inspection by a medical professional to establish the extent and nature of any sickness or injury.

Sense（3）

(education) A formal test involving answering written or oral questions under a time constraint and usually without access to textbooks; typically, a large, written test administered to high school and college students covering course material studied in a semester.

Sense（4）

Interrogation, particularly by a lawyer in court or during discovery.

examinations

（ plural ）

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examination

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