一般表达

Question 1

at the helm

Answer 1

掌舵

We cannot think of a better, more experienced hand at the helm than that of the Japanese delegation to lead us as we start our new year.
在我们开始新的一年时，我们想不出一个比日本代表团更好、更有经验的舵手来引领我们。

Question 2

disinformation

Answer 2

散布虚假信息

Question 3

once and for all

Answer 3

一劳永逸地

so that we can resolve the issue of Syria’s chemical weapons use once and for all
以便我们能够一劳永逸地解决叙利亚使用化学武器的问题

Question 4

thermal power plant

Answer 4

火电站/火力发电站

Question 5

deeply troubling

Answer 5

令人深感不安

Question 6

shed light on those matters

Answer 6

澄清这些问题

Question 7

tripartite agreement

Answer 7

三方协议