Airborne particle counter (APC) is important instrument for air cleanliness certification in cleanroom. The main error of APC is coincidence loss.

光散射式尘埃粒子计数器是用来测量空气洁净度的重要仪器，粒子计数器的主要测量误差为重叠损失误差。

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Further, as a key requirement for GDI certification would be no net loss of biodiversity, this would require monitoring the biodiversity performance of the land management and independent verification of outcomes.

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Psychologist Dr. Wallace Sife, author of "The Loss of a Pet, " founded the organization and runs the certification program, which explains how people grieve the loss of a pet.

CNN: How to deal with the loss of a pet