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1·Many senior citizens have been through two world wars.

许多年长的公民经历了两次世界大战。《柯林斯英汉双解大词典》

2·Many experts have given talks here that have focused on the medical care, and the development of public services for senior citizens.

很多专家在这里做过关于医疗保健和老年人公共服务发展的演讲。

3·People, especially the senior citizens, should take a routine examination every year.

人们，尤其是老年人，应该一年做一次常规体检。

4·Senior citizens 65 and older and disabled customers may ride for half the regular fare.

65岁及65岁以上的老年人及残疾人可半价乘车。

5·To enjoy the convenience of digital payment, many senior citizens started to use smart phone.

为了享受数字支付的便利，许多老年人开始使用智能手机。

6·To enjoy the convenience of digital payment, many senior citizens started to use smart phones.

为了享受数字支付的便利，许多老年人开始使用智能手机。

7·Market modification also means searching for increased usage among present customers or going for a different market, such as senior citizens.

市场调整还意味着要为现有客户提供更多的花样，或转向不同的市场，如中老年人市场。

8·Once upon a time, people who lived alone tended to be those on either side of marriage—twentysomething professionals or widowed senior citizens.

曾几何时，独自生活的人往往是婚姻中的任意一方——或是包括20多岁的专业人士，或是丧偶的老年人。

9·Now we have a growing population of senior citizens .

现在我们有一个人口不断增加的老年人。

10·Therefore, they are something senior citizens can use.

因此，他们是一些老年人可以使用。