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Difficult circumstances serve as a textbook of life for people.
农业的可持续性不是一种选择,而是我们星球未来的必需品。
量子力学的数学形式不仅是一种工具,更是一种揭示自然深层结构的语言。
The United States, in their expansive capacity, are capable of containing within their limits the whole population of the earth.
大家都是被命运所控制的人,一星半点都由不得自己。
Life is a poem written in tears and laughter.