another choice
There must be an alternative to children eating junk food all the time.
altitude
height above sea level
It is difficult to breathe in higher altitudes; oxygen masks are highly recommend.
apparatuses
a set of equipment or tools or machines which is used for a particular purpose
Before the rescue workers dove into the ocean, they checked their breathing apparatuses.
aviation
the art or science of flying airplanes
During the 1930s, America recaptured the technological lead in aviation.
BCE
before the common (or Christian) era
There is much debate about when the bible was written, but some scholars believe that the current first five books continued to be edited until about 800 bce.
crude
oil in a natural state that has not yet been treated
The world's top five crude oil producing countries are: Saudi Arabia, Russia, United States, Iran and China.
declines
to lessen in force
Gold increases in value over time, however, appliances declines in value.
engineering
the scientific planning of a machine, road, bridge
She studied civil engineering because she wanted to build bridges.
free-floating
lacking an apparent cause
In order to promote creativity, students are allowed to participate in free-floating experiments.
heavy-load
something that weighs a lot
The construction and stability of heavy-load ships allow them to carry extremely heavy objects
manned
to furnish with men, as for service
The phones at the crises center is manned 24 hours a day.
navigate
to steer a ship or airplane
Historians have found that even ancient ships were able to navigate the large open sea.
precursors
something which happened or existed before another thing
Biological research is often been a precursor to medical breakthroughs which benefit patients.
pressurized
to keep nearly standard atmospheric pressure inside
In recent years, pressurized rice cookers have come in vogue; cooks prefer the taste of rice cooked this way.
propelled
to push or move forward
The paddle boats at the lake are manually propelled.
scheduled
a list of the times when events are planned to happen
Our scheduled flight was delayed for more than ten hours.
supersonic
faster than the sound of sound
A French company was one of the first to successfully operate a supersonic passenger airline.
transnational
going beyond national boundaries
After the tsunami last year, aid came from transnational sources.
transportation
a means or system of moving something from one place to another
Korea's subway system is a very convenient form of public transportation; personal automobiles are not needed in Korea.
warring
describes countries or groups of people that are at war with each other
The two warring countries were in conflict with each other for centuries.
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