There has been mounting concern over the past several years that people and in particular, teenagers are using sunbeds excessively to acquire tans which are seen as socially desirable.

在过去几年里日益关注人们，以及特别是青少年，过度使用日光浴浴床使皮肤变黑，这在社会角度被认为是可取的。

youdao

This is the season of fake tans.

“假檀”是本季的流行风。

youdao

He pointed south across the Yellowstone River valley to a tiny dot of willow and aspen that seemed to explode in brilliant yellows against the backdrop of prairie tans and grays.

他又指着黄石河谷的南边，那里隐约能看到柳树和山杨，就好像在一片灰褐色中绽出的一点亮黄。

youdao

The Tans were warned that their little boy might face a wait for a bed, but, as it turned out, he was quickly looked after.

CNN: HOSPITALS IN FLUX

The last time the worldwide carbon level probably hit 400 ppm was about 2 million years ago, said Pieter Tans of the National Oceanic and Atmospheric Administration.

NPR: Experts: CO2 Record Illustrates 'Scary' Trend

The last time the worldwide carbon level was probably that high was about 2 million years ago, said Pieter Tans of the National Oceanic and Atmospheric Administration.

NPR: Greenhouse Gas Milestone; CO2 Levels Set Record