雙語例句：

　　Scientists continue to push back the boundaries of human knowledge.

　　科學家不斷擴大人類知識的范圍。

　　He is a writer first and a scientist second.

　　他首先是作家，然后才是科學家。

　　Scientists have established a connection between cholesterol levels and heart disease.

　　科學家已證實膽固醇含量與心臟病之間有關(guān)聯(lián)。

　　Scientists have a fairly negative attitude to the theory.

　　科學家對這個理論的.態(tài)度是相當消極的。

　　Scientists are on the brink of making a major new discovery.

　　科學家很快就會有新的重大發(fā)現(xiàn)。