appliance	a device, machine or piece of equipment, especially an electrical one that is used in the house, suc
approach	to come close in distance or time
approximately	used to show that something is almost, but not completely, accurate or correct
at once	immediately, without delay
complex	difficult to understand or fi nd an answer to because of having many different parts
demand	to make a very strong request for something; to need something in order to be successful at somethi
depend on	to rely on somebody/something and be able to trust them
from... onwards	continuing from a particular time
in short supply	not existing in large enough quantities to satisfy demand
hemisphere	one half of the earth, especially the half above or below the equator
sophisticated	advanced and worksing in a clever way machine
stand up to sb	to resist somebody; to not accept bad treatment from somebody without complaining
vary	(of a group of similar things) to be different from each other in size, shape, etc.
virtually	almost or very nearly, so that any slight difference is not important
put up with	to accept unpleasant behaviour or an unpleasant situation, although you do not like it