" We are obligated to keep a pulse on the population for at least five years after the foxes are delisted, " says Boser.

“在灰狐被移出濒危物种名单后，我们有义务对它们的数量保持为期至少五年的持续关注。”

As they towed it, they sent radar pulses on the frequency bands used by the satellites downwards into the snow and measured the amount of backscatter.

当他们拖着雪橇的时候，他们在卫星使用的频段向雪中发射雷达脉冲，并测量反向散射的数量。

" A lot of people have been going through life without a good pulse on their finances, because everything has kind of been working out, " says financial planner Mitchell Kraus of Santa Monica, Calif. -based Capital Intelligence Associates.

加州圣莫尼卡的理财规划师米切尔·克劳斯表示：" 很多人在生活中并未很好地了解理财，因为一切都规划好了。"