Note that p/t/k all carry a puff of air (aspiration), whereas b/d/g have no puff of air. The "p" consonant is like the p in English "pie" (IPA: /pʰ/). The "b" consonant is like the p in English "spy" and is not voiced like the b in "bye". Speakers of languages like French, Spanish, Hindi, Thai and Vietnamese will notice that pinyin "b", "d" and "g" equate to the p/t/k consonants in those languages.
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