My lesson

dog sled

a simple sled carried by dogs

canoe

a long narrow boat that is pointed at both ends and that is moved by a paddle with one blade

camel

a large animal of Africa and Asia that has a long neck and one or two large humps on its back and that is often used for desert trave

sailing boat

a small boat with sails

to invent

to ​design and/or ​create something that has never been made before:

to pollute

to make an ​area or ​substance, usually ​air, ​water, or ​soil, ​dirty or ​harmful to ​people, ​animals, and ​plants, ​especially by ​adding ​harmful ​chemicalspoisonous

poisonous

very ​harmful and ​able to ​cause ​illness or ​death:

diesel

a ​type of ​heavy ​oil used as ​fuel

engine

a ​machine that uses the ​energy from ​liquid ​fuel or ​steam to ​produce ​movement

locomotive

the ​engine of a ​train

pollution

​damage ​caused to ​water, ​air, etc. by ​harmful ​substances or ​waste

invention

something that has never been made before