Submitted by admin on Mon, 04/14/2014 - 22:48
definition:
A thing that is composed of two or more separate elements; a mixture;A substance formed from two or more elements chemically united in fixed proportions
sentence:
The air smelled like a compound of diesel and petrol fumes.
The layers of plants and animals slowly broke down into simple substances called hydrocarbons, compounds of hydrogen and carbon.
difficulty:
easy
toefl frequency:
2