app – n. a mobile phone program that performs a special function

button – n. a switch you press to control a piece of equipment

flap – adj. to move up and down quickly and repeatedly

mobile – adj. able to move or be moved easily

annoy – v. to make someone slightly angry

species – n. a group of animals or plants that are similar and can produce young animals or plants

monitor – v. watch something carefully

crowdsourcing – n. he act of giving pieces of work to a large group of people or to the public in order to gather information