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what is the unusual sound of mac book pro?like a type sound
it sounds like its your hard drive
Most likely your cooling fan has something stuck in it so its unbalanced hitting the frame of the fan enclosure. Get a small soft paint brush and a can of can’ed air as well as the needed tools to open your system. You’ll also likely need thermal paste and cleaner if you take the fan fully out. I would try first to just scrub what you can get to with the paint brush and then use a few short soft blasts of can’ed air to blow away the debris (Stop at Step7) Here’s the IFIXIT guide you’ll need to follow: MacBook Pro 13" Retina Display Early 2015 Fan Replacement
First check in the applications > utilities > activity monitor. Whether there are any large programs memory/leaking filling up the CPU. Making your machine run hot. It could be worth de-installing / upgrading any problematic software. Then second, reset the System Management Controller (SMC) https://support.apple.com/en-gb/HT201295 It could be picking up dust on the internal fan. You can take the rear cover & give it a dusting with a BONE DRY small paint brush MacBook Pro 13" Retina Display Early 2015 Fan Replacement
