1. 該計劃的妙處在于簡潔明了。
   The beauty of the plan consists in its simplicity.
2. 他發(fā)明了一種新的晶體管。
   He devises a new type of transistor.
3. 人類的種種經驗都證明了愛與怕之間的緊密聯系。
   All kinds of human experience testify to the close link between love and fear.
4. 發(fā)明了印刷術后文化教育才得以普及。
   Mass literacy was only possible after the invention of printing.
5. 人們已經發(fā)明了很多宰殺動物的人道方法。
   People have found many humane methods of killing animals.

了的英語翻譯：