[this is a live speech, "with" is unnecessary]
Since I took office as Commerce Minister of China, I have visited the United States on many occasions. However, this is my first time leading a delegation for a [formal] visit.
[offical is better than formal, it is better to say "on the official visit"]
We are here not just to seek convergence and cooperation, but also to establish a new relationship and open a new chapter.
[convergence? no idea to on what to converge]
As we all know, my old friend, as well as new counterpart, Mr. Garry Locke has just been appointed [as the] Commerce Secretary of the new federal administration.
[missing as, whose fedeal?]
There is an old saying in China, whose English equivalent is “a new broom sweeps clean”.
[No clue on this one. Here is my one: An old saying in China says, “a new broom sweeps cleaner than old ones” in English equivalent.]
I would be happy to hear what this newly-appointed official[s], as well as the other newly-appointed official[s], Mr. Kirk, the US trade representatives, have to say about new plans and proposals for the Sino-American trade and economic relations.
[There is no plans or proposal yet. it should be:
I would be happy to hear what new plans and proposals for the Sino-American trade and economic relations from this newly-appointed officials, as well as the other newly-appointed officials, Mr. Kirk, the US trade representatives are.
]
I would also exchange with them [some of] our new ideas.
["some of": unnecessay.
i would also want to exchange with them our new ideas]