water treatment plant – n. a facility where water is cleaned before it is drunk or placed into a river or ocean

filter – n. a device that is used to remove something unwanted from a liquid or gas that passes through it

device – n. an object, machine or piece of equipment that has been made for a special purpose

glue – v. to make (something) stick to something else by using glue

track – v. to watch or follow the progress of (someone or something)

circuit board – n. a board that has many electrical circuits and that is used in a piece of electronic equipment (such as a computer)

opportunity – n. an amount of time or a situation in which something can be done