the way someone seems to feel
Mad cow disease can affect all kinds of cows.
build up
to accumulate
The snow is building up on the sidewalk.
caffeine
a chemical found in coffee, tea, and cola
If I drink too much coffee, the caffeine makes me feel very nervous and I cannot sleep.
chemical
화학제품
Harmful chemicals from the factory are entering the river.
dose
the measured amount of medicine or drug that is taken at a time
Given this man's large size, such a small dose of this medicine will hardly have any effect.
effect
the result of a particular influence
His speech had no effect on the crowd.
expert
a person who is skilled through training or practice
The professor is an expert in physics.
harmful
causing injury or trouble
This is important because we breathe in harmful things like smoke and dirt in the city.
material
anything out of which something is
Designers choose their material and cut it into pieces.
researcher
someone who does research work
The researchers realized that the monster never existed.
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