随着时间累积，低生育率不止会儿童数量减少，随着需要人照顾的老年人人口膨胀，处于工作年龄段的人口数量也会减少。
Over time, low birth rates lead not only tofewer children, but also to fewer working-age people just as the percentage ofdependent elders explodes.
结果：水杨酸和苯甲酸的累积透皮吸收百分率与时间呈线性关系。
RESULTS The cumulative penetration rate of salicylic acid and benzoic acid was linear related to the time.
晒黑、多形性日光疹和光老化患病率随着执勤官兵高原入伍时间延长而增高，随着累积日照时数增多而增高；
With the time of being in the army and cumulative sun-exposure period, the prevalence of tanning, photoaging and polymorphous light eruption increased, while the prevalence of sunburn decreased.
应用推荐