YSK: If an old laptop is constantly running it's fans it may be full of dust, you can quite easily remove it to improve noise, battery life, and even performance.
from /r/YouShouldKnow
YSK：如果一臺舊的筆記本電腦不斷地運行它的風扇，它可能充滿了灰塵，你可以很容易地清除它以改善噪音、電池壽命，甚至性能。
YSK：如果一臺舊的筆記本電腦不斷地運行它的風扇，它可能充滿了灰塵，你可以很容易地清除它以改善噪音、電池壽命，甚至性能。
YSK: If an old laptop is constantly running it's fans it may be full of dust, you can quite easily remove it to improve noise, battery life, and even performance.
from /r/YouShouldKnow