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。
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。
According to Pieter Tans, the doyen of the field at NOAA, the country currently has 17 or 18, so that will improve things by a factor of four.
据NOAA的元老级人物彼得。坦斯称，美国目前为止有17,18台，所以增加的监测器可增加到原来的4倍。
According to Pieter Tans, the doyen of the field at NOAA, the country currently has 17 or 18, so that will improve things by a factor of four.
据NOAA的元老级人物彼得。坦斯称，美国目前为止有17,18台，所以增加的监测器可增加到原来的4倍。
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