| aircraft |
any machine that can fly through the air, such as an airplane, helicopter, glider, or balloon. |
| available |
able to be used or possible to get. |
| awkward |
without physical skill or grace; clumsy. |
| crest |
a tuft of feathers, bone, or fur on an animal's head, or something that looks like this. The comb of a rooster is one kind of crest. |
| disappearance |
the act of disappearing or the fact of having disappeared. |
| encourage |
to give hope or courage to; give confidence to. |
| exhibit |
a collection of things that are shown or on display for many people to look at. |
| foreign |
in, from, or having to do with a country that is not one's own. |
| idle |
not active or in use; not working. |
| interrupt |
to cause to stop; break off. |
| manual |
a book of instructions. |
| reliability |
the quality of being dependable. |
| represent |
to stand for or be a sign of. |
| unsuccessful |
not resulting in or achieving the desired goal. |
| weaken |
to make weak or weaker; to cause (something) to be less strong. |