| artificial |
made by human beings; not natural. |
| content1 |
(usually plural) whatever is held or contained in something. |
| distress |
a state of great need or trouble. |
| echo |
the repeating of a sound caused by the bouncing of sound waves from a surface. |
| efficient |
operating or working in a way that gets results, with little wasted effort. |
| enjoyable |
pleasant; giving joy. |
| entertain |
to amuse; keep interested. |
| friendship |
the relationship of people of who know and like each other. |
| outward |
on or moving toward the outside or surface of. |
| plastic |
an artificial substance made from certain kinds of chemicals that can be easily shaped when soft. Plastic is formed into many materials and products. |
| telescope |
an instrument that uses lenses and sometimes mirrors to make distant objects appear larger. |
| tunnel |
an underground or underwater passage created so that people or vehicles can go through it. |
| unlike |
different; not equal. |
| virus |
a tiny organism that can reproduce only in living cells. Viruses cause disease in humans, animals, and plants. |
| wonder |
to feel admiration, surprise, or amazement (often followed by "at"). |