God knows what might happen if human beings were exposed to long-term contact.

Those ties inevitably developed over long-term, face-to-face contact, but e-mail can help keep them strong.

Most of the top news anchors and correspondents at other networks are under long-term contacts.

Unfortunately, long-term contact with the aliens and their extra-dimensional technology leads to various health problems in most humans.

This proposal is controversial, however; the shared vocabulary may be better explained as intensive borrowing due to long-term contact.

"Due to his long-term contact with the group, which was living with false identities, he knew of their terrorist crimes," the statement said.

In this case, they were going to be in long-term contact with local females.

This was definitely made easier by long-term contact with foreign partners.

Allergies are not uncommon, and repeated long-term contact with some metals (or their compounds) may cause cancer.

Or they may point to long-term contact with low levels of chemicals at work, perhaps while working in an office with poor ventilation.