El ajuste fino mejora la comprensión del habla.

Because ajuste fino is a noun phrase, and in this sentence it is being treated as a specific concept: the fine-tuning or fine tuning.

• ajuste = adjustment, tuning
• fino = fine, precise

In Spanish, it is very common to use the definite article with general or abstract nouns, especially when talking about a concept in a general way. So el ajuste fino sounds natural.

English often drops the article in cases like Fine-tuning improves..., but Spanish usually keeps it: El ajuste fino mejora...

Ajuste fino is a set phrase that usually means fine-tuning, precise adjustment, or refinement.

It can be used in technical, scientific, educational, or even everyday contexts. In this sentence, it probably refers to making something more precise so that speech is understood better.

So although the words are literally:

• ajuste = adjustment
• fino = fine

the phrase as a whole is best understood as fine-tuning.

In Spanish, adjectives usually come after the noun.

So:

• ajuste fino = fine adjustment / fine-tuning

That is the normal word order. Putting the adjective before the noun is possible in some cases, but it often changes the tone or meaning. Here, ajuste fino is the standard and natural order.

Because mejora here is a conjugated verb, not the infinitive.

The subject is el ajuste fino, which is singular, so the verb is in the third person singular present:

• mejorar = to improve
• mejora = improves

So the sentence structure is:

• El ajuste fino = subject
• mejora = verb
• la comprensión del habla = object

In other words: Fine-tuning improves speech comprehension.

Because comprensión is a feminine singular noun, so it takes la.

• comprensión = comprehension, understanding

The ending -ción is very commonly feminine in Spanish:

• la comprensión
• la información
• la comunicación
• la pronunciación

So la comprensión del habla means the comprehension of speech or more naturally speech comprehension.

Because the written accent shows where the stress goes: com-pren-SIÓN.

Without the accent mark, Spanish stress rules would suggest a different pronunciation. The accent tells you that the final syllable is stressed.

This is very common with nouns ending in -ción:

• comprensión
• atención
• educación
• explicación

These words are usually stressed on the last syllable.

Because del is the contraction of de + el.

So:

• de + el = del

The interesting part is that habla is actually a feminine noun, but like some feminine nouns that begin with a stressed a sound, it uses el in the singular for easier pronunciation.

So you get:

• el habla
• del habla

This is similar to:

• el agua fría
• el alma humana
• el águila grande

Even though these nouns are feminine, they use el in the singular. The adjectives still behave as feminine when needed.

It is feminine.

That can be confusing because the sentence has del, which comes from de + el. But habla belongs to a group of feminine nouns that take el in the singular because they begin with a stressed a sound.

So:

• singular: el habla
• plural: las hablas

This special article change does not make the noun masculine. It is still feminine.

Because habla is a noun, while hablar is an infinitive verb.

• habla = speech
• hablar = to speak

In this sentence, the idea is comprehension of speech, so a noun is needed:

• la comprensión del habla

If you used hablar, it would mean something more like understanding how to speak or it would require a different structure.

Yes, that is a possible literal translation. But in natural English, people would usually say something like:

• Fine-tuning improves speech comprehension.
• Fine-tuning improves understanding of speech.

So the Spanish is fairly literal, but the most natural English translation often sounds a little smoother.

Because habla here refers to speech as a noun, and it is being used in a general, definite sense: the phenomenon of speech.

So la comprensión del habla means the comprehension of speech or speech comprehension.

If you said comprensión de habla, it would sound incomplete or unnatural in most contexts. Spanish usually wants the article here.

Yes. In this sentence, mejorar is being used as a transitive verb, meaning something improves something else.

Structure:

• El ajuste fino = what does the improving
• mejora = improves
• la comprensión del habla = what gets improved

So the sentence means that fine-tuning has a positive effect on speech comprehension.

The h in Spanish is silent.

So habla is pronounced roughly like AH-bla.

That means:

• habla sounds as if it began with a
• this helps explain why it takes el in the singular, since the stressed opening sound is a

This silent h is very common in Spanish:

• hola
• hablar
• hora
• hacer

It sounds somewhat formal or technical, especially because of the phrases:

• ajuste fino
• comprensión del habla

This kind of wording would fit well in contexts like:

• linguistics
• speech technology
• education
• psychology
• machine learning
• research writing

It is still perfectly normal Spanish, but it does not sound especially casual.