“Are you in contact [=in touch] with them?” “No, I haven't been in contact with them for years. I don't even know where they live anymore.”“你与他们有联系吗？”“没有，我已经多年没和他们联系了，甚至连他们住哪儿都不知道。”

We kept/stayed in close contact [=we communicated often] after college.大学毕业后，我们一直保持着密切联系。

He's been in direct contact with the president. [=he has communicated directly with the president]他已经和总裁有了直接联系。

We'd lost touch, but a mutual friend put us in contact (with each other) again.我们曾经失去过联系，但一位共同的朋友又让我们重新建立了联系。