我们为了商务、联系亲友而写信。
We write letters both for business and keeping in touch with friends and relatives.
囚犯有时候用手机和外面的亲友联系，众所周知，从监狱里面打电话，接电话的人要付不少钱。
Inmates sometimes use cell phones to keep in touch with friends and family on the outside - collect calls made from inside prison facilities are notoriously expensive.
美国近四分之一的年长人士使用Facebook，73%的人称他们通过该网站与亲友保持联系，但不仅是和他们儿女和孙辈。
Nearly a quarter of older Americans are on Facebook and 73 percent said they use it to stay in touch with relatives, but not just their children and grandchildren.
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