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Is the word pesquisas the same in Brazilian and European Portuguese?

Yes

The meaning, grammar, and spelling of "pesquisas" are identical in both Brazilian and Continental Portuguese. The only differences lie in pronunciation:

• Vowel Reduction: In Continental Portuguese (Portugal), unstressed vowels are often "swallowed" or reduced to a near-silent sound (schwa). The "e" in pesquisas sounds much more closed or almost disappears, whereas in Brazil, the vowels are more open and clearly articulated.
• Sibilance: In Portugal, the "s" at the end of syllables or words is typically pronounced as a "sh" sound ([ʃ]). In most regions of Brazil, while some coastal areas also use the "sh" sound, much of the country uses a more dental "s" ([s]).

Brazilian Portuguese Examples

1. Fiz algumas pesquisas no Google para encontrar o endereço. (I did some searches on Google to find the address.)
2. As pesquisas de mercado indicam que o produto será um sucesso. (Market research indicates that the product will be a success.)
3. Ele está realizando pesquisas científicas sobre o clima. (He is conducting scientific research on the climate.)
4. As pesquisas eleitorais mostram uma disputa acirrada. (The election polls show a tight race.)
5. Preciso fazer mais pesquisas antes de escrever o relatório. (I need to do more research before writing the report.)

Continental Portuguese Examples

1. Fiz umas pesquisas na Internet para ver o horário. (I did some searches on the Internet to check the time.)
2. As sondagens apontam para uma mudança de governo. (The polls point to a change in government. — Note: "Sondagens" is more commonly used than "pesquisas" when referring to political polls.)
3. Ele dedica-se a pesquisas académicas de alto nível. (He dedicates himself to high-level academic research.)
4. As pesquisas sobre este tema são muito escassas. (Research on this subject is very scarce.)
5. Fiz uma pesquisa para o meu trabalho de curso. (I did a survey/research for my coursework.)