A mainframe is a computer that is used for a lot of serious business. It is usually much more expensive than a regular computer, and it is not usually used by people who are just surfing the Internet.
A behemoth is a large, powerful animal. Some of the most famous behemoths include the elephant, the lion, and the whale.
Patchy means uneven or unevenly distributed. The leaves on the tree are patchy because they are not uniform in their size or color.
To reassemble something is to put it back together the way it was before it was broken. When you reassemble a toy, you have to put all the pieces back together in the right order.
Physicists are people who study the basic laws of physics. They are also responsible for developing new methods of measuring physical phenomena.
To invent something is to come up with a new idea, to create something new. Inventors often have to think outside the box to come up with new ideas.
Workable means that something is possible or reasonable. It's possible to workable agreement between the two companies.
energetically means with energy and enthusiasm. She energetically danced throughout the party.
Skiving is the act of not doing your work. Sometimes people skive off of school or work to go play sports or do other activities.