到达年龄
Every person who has attained the age of 15 years shall carry the identity card with him at all times.───凡年满15岁的身份证持有人应时刻随身携带其身份证。
risk is relatived not only with dose, but also with age at exposure, time since exposure, attained age and some other factors.───风险不仅与剂量有关，还与受照射时年龄、照后经过时间和到达年龄等因素有关。
advanced age───高龄，老年
attained───vt.取得，得到，获得（attain的过去式）
attainment target───成就目标
untrained eye───未经训练的眼睛
attainment targets───获得性目标
atomic age───n.原子时代
attainable───adj.可得到的；可达到的；可到达的