In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.

Q: El Salvador ( ; -RSB- ) , officially the Republic of El Salvador ( , literally " Republic of The Savior " ) , is the smallest and the most densely populated country in Central America .

A: El Salvador is the smallest and most densely populated country in Central America .
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Q: In conventional usage , boredom is an emotional and occasionally psychological state experienced when an individual is left without anything in particular to do , is not interested in their surroundings , or feels that a day or period is dull or tedious .

A: Boredom is an emotional state that comes when a person has nothing to do , and is not interested in anything .
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Q: The SI unit of kilogram per cubic metre ( kg / m ) and the cgs unit of gram per cubic centimetre ( g / cm ) are probably the most commonly used units for density .

A:
The most common SI units for density are g / cm and kg / m .
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