5. I'm on your side.

　　我是站在你这边的。

　　还能这样说：

　　I will support you.

　　I stand by your side.

　　谚语：

　　The grass is greener on the other side.

　　这山看着那山高。

　　6. He's efficient.

　　他很能干。

　　还能这样说：

　　He is capable.

　　He has a lot on the ball.

　　应用解析：

　　efficient in 在……有成效;

　　be fully efficient 充分发挥效力的;

　　be highly efficient 高效率的

　　7. He's very vague.

　　他是个难以捉摸的人。

　　还能这样说：

　　He is difficult to understand.

　　He isn't very clear.

　　应用解析：

　　one's very thoughts 正是某人的想法;

　　the very reverse of the truth 与事实完全相反

　　8. He's faithful.

　　他是守信用的人。

　　还能这样说：

　　He is a man of his word.

　　He stands to his word.

　　应用解析：

　　words and deeds 言与行;

　　word came that 有消息传来说