我从未见过一只野生动物为自己感到难过。一只小鸟会冻死在树枝上,却从不自怜。
Every problem in mathematics is a puzzle waiting to be solved, and the joy is in the solving.
The weight of stone is nothing compared to the weight of responsibility we carry.
气候变化对海洋生物构成最大威胁,我们必须立即采取行动减轻其影响。