法律的概念是復雜的，不容易定義。
The concept of law is a complex one, and it is not easy to define.
Innovation in forestry means balancing technology with tradition to create solutions that last.
The end of government is the good of mankind.
The future of livestock lies in balancing productivity with ethical responsibility.
世界是一本書，不旅行的人只讀了一頁。
統(tǒng)一自然界所有力的挑戰(zhàn)是一個多世紀以來推動理論物理學發(fā)展的動力。
量子力學的數(shù)學形式不僅僅是一種工具，而且是現(xiàn)實深層結構的反映。