These solar lights don't require expensive parts, expert upkeep or a power source.

Perhaps a very talented human could build a chemical processor without the help of the robots, but it would still require parts.

This system requires very few moving parts, and therefore leads to lower maintenance costs.

Likewise, he asserts that biological systems require multiple parts working together in order to function.

He said several bomb threats had required all or parts of terminals to be cleared, but would provide no details.

But hospital incubators are complicated machines that require special parts.

Although many potential customers may only require parts of the information system, a decision was made that only complete systems could be sold.

This would require parts of the process to be kept secret from the parent.

They require less parts and floor space and have favorable downward chip control.

Some robots may require special parts in order to be used.