La teoria spiega il risultato.

La is the definite article meaning the for a singular feminine noun.

Here, teoria is a feminine singular noun, so it takes la:

• la teoria = the theory

In Italian, articles usually have to agree with the noun’s gender and number.

Because the two nouns have different grammatical genders:

• teoria is feminine → la teoria
• risultato is masculine → il risultato

This is grammatical gender, which does not always match anything logical in the real world. It is simply part of how the noun behaves in Italian.

Yes, teoria normally means theory.

It is very close to the English word in both form and meaning, so it is an easy cognate for English speakers.

Spiega means explains.

It comes from the infinitive spiegare = to explain.

In this sentence:

• la teoria = the subject
• spiega = explains
• il risultato = the object

So the structure is:

The theory explains the result.

Because spiegare is the infinitive form, meaning to explain, while spiega is a conjugated form used with the subject la teoria.

Spiega is the third person singular present tense form:

• io spiego = I explain
• tu spieghi = you explain
• lui/lei spiega = he/she explains

Since la teoria is singular and functions like it, Italian uses spiega.

Italian usually does not need subject pronouns when the subject is already stated or clear from the verb.

English says:

• The theory explains the result

Italian says:

• La teoria spiega il risultato

There is no need to add a separate word for it, because la teoria is already the subject.

Italian uses articles more often than English.

So Italian naturally says:

• la teoria
• il risultato

Even where English might sometimes say just theory or result depending on context, Italian often keeps the article. In this sentence, both nouns are presented as specific things, so the definite articles are normal and expected.

Because risultato is being used as a specific direct object: the result.

Italian commonly uses the definite article here:

• il risultato = the result

Without the article, risultato would sound less complete in this sentence unless it were part of a different structure or style.

Yes. Risultato means result, outcome, or sometimes finding/resulting effect, depending on context.

In this sentence, il risultato is simply the result.

This is the normal Italian word order:

• subject + verb + object

So:

• La teoria = subject
• spiega = verb
• il risultato = direct object

This matches standard English order quite closely:

• The theory explains the result

Italian can change word order for emphasis, but this sentence is the basic, neutral pattern.

Yes. Il risultato is the direct object of spiega.

It answers the question:

• What does the theory explain?
• The result

That is why there is no preposition before it. In Italian, as in English, explain can take a direct object directly.

It is pronounced approximately spyEH-ga.

A few helpful points:

• spi- sounds like spee with a short glide into the next vowel
• -e- is pronounced clearly
• g before a is a hard g, like in go

So spiega is roughly:

• spyEH-ga

The stress falls on spie.

Because this is a normal sentence, not a title, and the nouns are common nouns, not proper names.

So Italian writes:

• La teoria spiega il risultato.

just like English writes:

• The theory explains the result.

Only the first word is capitalized because it begins the sentence.

Usually, with la teoria, the sentence sounds like it is referring to a particular theory: the theory.

If you wanted a more general or abstract sense, Italian might use a different structure depending on context. But as written, La teoria spiega il risultato most naturally means:

• The theory explains the result

That is, a specific theory and a specific result already known in the context.