The condenser is interposed between the light source and the specimen .

在光源和标本之间是聚光镜。

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When the specimen area is larger than the mouth area, this overlay upon the ledge is a source of error, particularly for thick specimens.

当试样面积大于杯口面积时，试样在透湿杯边缘的覆盖就成为一个误差来源，尤其是对于较厚的试样。

youdao

The condenser is interposed between the light source and the specimen.

在光源和标本之间是聚光镜。

youdao

Instead, to judge by the most comprehensive study on the reliability of forensic evidence to date, the error rate is more than 10% in five categories of analysis, including fiber, paint and body fluids. (Meaning: When the expert says specimen X matches source Y, there's a 10% probability he's wrong.) DNA and fingerprints are more reliable but still not foolproof.

FORBES: Forensic evidence doesn't always tell the truth.