23. Over a very large number of trials, the probability of an event’s occurring is equal to the probability that it will not occur. 23.在大量的实验中，某一事件发生的几率等于它不发生的几率。
Be yourself, don't change for anyone. If they don't like you at your worst, then they don't deserve you at your best.------ 勇敢的做自己，不要为任何人而改变。如果他们不能接受最差的你，也不配拥有最好的你。
24. Most substance contract when they freeze so that the density of a substance’s solid is higher than the density of its liquid. 24.大多数物质遇冷收缩，所以他们的密度在固态时高于液态。
The rain falls because the sky can no longer handle its weight．Just like the tears fall because the heart can no longer handle the pain．------ 雨水落下来是因为天空无法承受它的重量，眼泪掉下来是因为心再也无法承受那样的伤痛。
26. By the middle of the twentieth century, painters and sculptors in the United States had begun to exert a great worldwide influence over art. 26.到了二十一世纪中叶，美国画家和雕塑家开始在世界范围内对艺术产生重大影响。
28. Elizabeth Blackwell, the first woman medical doctor in the United States, founded the New York Infirmary, an institution that has always had a completely female medical staff. 28. Elizabeth Blackwell，美国第一个女医生，创建了员工一直为女性纽约诊所。
29. Alexander Graham Bell once told his family that he would rather be remembered as a teacher of the deaf than as the inventor of the telephone. 29. Alexander Graham Bell曾告诉家人，他更愿意让后人记住他是聋子的老师，而非电话的发明者。
