The sulfur leaves a pale yellow stain on the ice, and scientists say it's a clear sign of biological activity.

它是地球上人们已知的唯一一个天然温泉中的硫磺沉积于冰面的地方。 硫磺在冰面上形成了一个浅黄色的斑点，科学家说这是生物活动的明显标志。

youdao

My biological mother later found out that my mother had never graduated from college and that my father had never graduated from high school. She refused to sign the final adoption papers.

但是，我的生母后来发现我的养母不是大学毕业生，我的养父甚至连中学都没有毕业，所以她拒绝在最后的收养文件上签字。

youdao

Fat has a biological purpose: for most of history it was a sign of vitality and rich men were proud of their rotund wives - look at the ideal of human beauty in a Rubens painting.

脂肪是能派上生物用途的。在历史上的大部分时期，肥胖是生命力的象征，富人们以自己妻子的丰腴为美。不信就看看画家鲁本斯（Rubens）笔下的人体美吧。

youdao

Hatfill identified his accuser as Barbara Hatch Rosenberg, a woman he said he has never met but with whom he disagrees over whether the United States should sign a biological weapons treaty.

CNN: Scientist under scrutiny denies anthrax link

Not only did it improve patients' lung function, it lowered the amount of salt in their sweat, a sign that it may combat CF at its biological root.

FORBES: Magazine Article