Various kinds of molluscs are also frequently introduced into aquaria by accident.

Anpanman has a long history and new characters are frequently introduced, keeping the series fresh.

As the run went on, songs were constantly changed and new business frequently introduced, especially when there were cast changes.

Many of them did not know each other; those who did, frequently introduced friends who happened to be guests.

New drugs are frequently introduced, and some are priced 20 or 30 times as much as older treatments for the same illnesses.

However only a small proportion were found to be controlled in this manner, and older girls frequently introduced younger ones into the trade.

New software is frequently introduced that is not compatible with older software.

Ms. Shannon said she is frequently introduced as a state representative instead of as a senator.

Since its introduction, Nike has frequently introduced new and updated models in the same product line.

They are frequently introduced as a component of speech therapy, but can also be used at school and at home.