1·This arrangement peaked around 1940, when about 35% of the nation's 18-year-old to 34-year-old lived with mom or dad (compared with 32% in 2014).
这一安排在1940年左右达到顶峰，当时美国18岁至34岁的人口中约有35%与父母生活在一起（2014年为32%）。
2·They found that the average person's mind wandered most frequently about 65% of the time during personal activities, such as brushing their teeth and combing their hair.
他们发现，一般人在刷牙、梳头等个人活动中最常走神，约有65%的时间在走神。
3·About 4% of the prison population have chronic psychiatric illnesses.
约有百分之四的监狱犯人患有慢性精神疾病。
—— 《柯林斯英汉双解大词典》
4·About 1,200 personnel will remain behind to take care of the air base.
约有1200名人员将留下来照管空军基地。
—— 《柯林斯英汉双解大词典》
5·About 9% attempted to conceal "nonessential Internet use", and nearly 4% reported feeling "preoccupied by the Internet when offline".
约有9%的人试图隐瞒自己“非必要的上网行为”，近4%的人报告说，他们“离线时也感觉被网络占据着大脑”。