三十四、Pose a great threat to ~~ (对......造成一大威胁)
　　例句：Pollution poses a great threat to our existence.
　　污染对我们的生存造成一大威胁。

　　三十五、do one‘s utmost to + V = do one‘s best (尽全力去......)
　　例句：We should do our utmost to achieve our goal in life.
　　我们应尽全力去达成我们的人生目标。