If the angular velocity of a body changes, it is said to have an angular acceleration . 如果物体的角速度是改变的，就说这个物体具有角加速度。
It is said that the children of the very poor are not brought up, but dragged up . 据说穷人家的孩子不是抚养大的，而是没人管教就自个儿长起来了。
It is said that if anyone touches the tree , he will have bad luck ; if he picks a leaf , he will die . 据说谁要摸了这棵树，谁就要倒霉；如果他摘了一片叶子，他就会死。
It is said one of the emperors admired a particularly intricate grasshopper cage, one of his craftsman had constructed . 据说一位皇帝十分赞赏一位能工巧匠做的一个精致的蝈蝈笼。
It is said to be a sign that the debts due from london to paris are compensated by those due from paris to london . 据说那就显示伦敦欠巴黎的债务，恰被巴黎欠伦敦的债务所抵消了。
It is said that during one of the grand eruptions of vesuvius it discharged massy rocks weighing many tons a thousand feet into the air . 据说有一次，维苏威火山大爆发时，好多吨重的大岩石全给轰到千英尺高空。
It is said that she had relations among king charles's enemies; that she was in correspondence with them, and that she gave them information . 有人说，查理国王的敌人里面有她的亲戚，她和他们保持联系，把消息透露给他们。
It is said that he gave her a slap on the cheek 据说他在她的脸颊上打了一巴掌。
" it is said that the loss of one ounce of seminal fluid 这里说失去一盎司的精液
