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commit to对…作出承诺, 承担义务, 担负责任; 使(自己)致力于…
例句：I must go. I have committed myself to the club tonight and the members are expecting me.
我得走了, 我已经答应今晚去俱乐部, 会员们正等着我呢。
He has committed himself to the cause of education.
他已决心献身教育事业。
2.On a scale of one to ten, we rate this summit at two. It didn’t accomplish nothing but it didn’t come close to its potential.
on a scale of按…的等级
例句：judging on a scale of 1 to 10.
质量标准分为10个等级。
come close to接近
例句：The bill will come close to fifty dollars.
账单接近五十元。
3.But he also said Mrs. Clinton would make clear to the Afghan president that the US and its allies expect him to do better in the coming years than he did during his last term as president.
in the coming years即将到来的几年，未来的几年
4.Security was tight at the packed stadium after violence surrounding an earlier match.
pack是塞，挤的意思，Packed就是拥挤的，相当于crowed。