"Essa regra é básica e fundamental."
Translation:That rule is basic and fundamental.
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I assume you think this because it has the terms basic and fundamental. Well, there are not necessarily synonymous. In fact, they can even be diverse. Take the concept of the fundamental theorem of calculus which states that all functions should be differentiable and integral. It's fundamental for sure, but it's not basic and that's even surer! try proving it and you'll see. Thus, the sentence is not redundant.
This is in part b/c a machine algorithm generates these audios and sometimes the enunciation is indistinct to eng speakers. BTW, you can test this if you have MS Word, the latest version. Turn on Read Aloud and the language to ptg and you will hear a voice (maybe female) much like the ones you hear in this app.