If astronomers could observe metallicity gradients in spiral galaxies billions of light-years away, we could see how steep the gradients were billions of years ago and thus how they change over time.

如果天文学家能够观测到十亿光年外的螺旋星云的金属丰度梯度，我们就可以知道亿万年之前的梯度有多大，因此也就可以知道它是如何随时间变化的。

youdao

They don’t take the time to observe the ground beneath their feet. Hence, they are incapable of seeing and feeling the optimal way forward.

若人们没有花时间观察所处的环境，那么也无法认清和感受到最佳的前进道路。

youdao

They don't take the time to observe the ground beneath their feet. Hence, they are incapable of seeing and feeling the optimal way forward.

若人们没有花时间观察所处的环境，那么也无法认清和感受到最佳的前进道路。

youdao

But sardonic souls in other parties are prone to observe that, as dinner time approaches, they are particularly prone to vote, not with their head or their heart - but with their stomach.

BBC: Voting with the heart - and stomach