Animals are used as food either directly or indirectly by the products they produce.

They are also used by mortars and machine guns firing indirectly.

It is also used indirectly for the production of drinking water.

In the case of combined heat and power systems, the engine's cooling water is used directly or indirectly for heating purposes.

It would apply whether the Federal money was used directly or indirectly for those purposes.

Most soft money could only be used indirectly, advocating positions that the party supported and criticizing policies of the opposition.

However, it can be used indirectly in the following instances:

Air permeability can be used indirectly to estimate the MacMullin number.

Concessions for downloading is only issued to civilian satellites, yet some data has been indirectly used by armed forces.

In these ways, seafoods are indirectly used to produce further food for human consumption.