She advises, "You don't want to sign up for a $10,000 vet tech course only to find out later that you faint at the sight of puppy blood!"

她建议说，“你也不想报名上了一万美金的兽医课，结果只发现你晕血！”

youdao

You can set the value as low as 3.0 if you want to detect very faint objects if you use clean, well calibrated images.

如果你的图片噪点少且定标准确，你可以将此值设置为3.0或更低用于检测更暗的目标。

youdao

The reason astronomers want to observe reflected sunlight during the transit of Venus is to test whether they can detect the faint imprint of passage of the sun's light through the atmosphere of Venus.

CNN: A transit of Venus, an age of wondrous science