Life is the sum of all your choices.
The path to clean energy begins with making current practices cleaner.
亲眼目睹世道的变化趋向,才知道国家治乱的关键必定在于人心的向背和风俗的好坏。
Marine ecological balance is more important than short-term economic benefits, we must have long-term vision.
最好的故事来自提出困难的问题,而不是提供简单的答案。
根据问题出现的背景,代数实部可以接受从负无穷到正无穷的所有数值。