To study again to remind yourself about something.

group of people with common characteristic.

any of class of synthetic materials which are polymers with chemical structure based on chains of alternate silicon and oxygen atoms. join or otherwise treat something with silicone.

season after winter and before summer, in which vegetation begins to appear, in northern hemisphere from March to May. Coils of metal that lessen impact, e.g. on cars. move or jump suddenly or rapidly upwards or forwards.

Soft when pressed.

Developed or made with great care.

To succeed in doing good, usually by working hard.

panel of keys on computer or typewriter. enter data by means of keyboard.

device for making and breaking connection in electric circuit. Changes or shifts from one method to another. To exchange or replace something for another thing.

in space separating things. In the space that separates two objects.

Used to add new (often different) information.

Done without thought or feeling; automatic. working parts of vehicle.

To make something a little wet.

time in morning when daylight first appears.

person or thing that is preferred to all others of same kind. The ones you like the best. record address of website or other data.