1.speak for itself 无需进一步说明，不言而喻
例句：How suave was the counsel of his appearance! How feelingly did his superior state speak for itself!
他温文尔雅的外表本身就多么具有说服力埃他身份高贵又是多么显而易见！
2.speak one’smind 把想法说出来
例句："On an occasion of this kind it becomes more than a moral duty to speak one's mind. It becomes a pleasure" (Oscar Wilde).
“在这样的场合下，说出自己的心里话不仅是道德上的责任，也是一种乐趣”（奥斯卡·王尔德）。
3.specialize in 专门研究，专门从事
例句：Her intense wish was to qualify for the Indian police force so she could specialize in enforcement of the child marriage prohibition law.
她的强烈愿望是取得印度警员资格，这样她就可以专门致力于废除童婚法律的执行了。
4.speculate on 思考,思索,猜测，推测，推断
例句：The company declined to speculate on how much asset sales have raised so far.
AIG拒绝推测迄今已通过资产出售筹集了多少资金。
5.speed limit （尤指在特定地区为汽车行驶规定的）速度极限
例句：The policeman told him that he had been exceeding the speed limit and asked to see his documents.
警察说他一直在超速驾驶并要求看他的证件。
6.speed up （使）加快速度
例句：The spokesman said the train speed up to 250 kilometers per hour.
这名发言人说，列车行驶速度最高可达每小时250公里。