Why does she buy a certain product, where and how often?

"There are only certain products for which it is appropriate."

The real question, therefore, is whether certain products are to be identified in a particular way.

In this example the sales of a certain product over time is shown.

There will still be a zero rate for certain products.

Certain products with which children come into contact are not currently safe enough.

But part of the law says that if the Government has a real need for a certain product it can issue a special contract.

Also so the general public is aware that they are covered when using certain products.

Taking certain products together can cause you to get too much aspirin.

"But when the price comes down it may be cost effective to manufacture certain products in space."