I know that you've been studying chimpanzees for thirty years now

　　我知道你研究黑猩猩至今已有30年了。

　　I invite every citizen to carefully study the document.

　　我請每位市民都仔細研讀該文件。

　　They totally overlooked the study of the subject.

　　他們完全忽視了對這個(gè)問(wèn)題的研究。

　　This is outside the range of our study.

　　這不屬于我們研究的范圍。

　　The study also demonstrated a direct link between obesity and mortality

　　該研究還表明了肥胖癥和死亡率之間存在直接的聯(lián)系。

　　Several colleges in our study have rigid rules about student conduct

　　在我們的研究中，有幾所大學(xué)制定了嚴格的學(xué)生行為規則。

　　Doctors study the structure of the human body.

　　醫生研究人體構造。