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：如果一台旧的笔记本电脑不断地运行它的风扇，它可能充满了灰尘，你可以很容易地清除它以改善噪音、电池寿命，甚至性能。
YSK：如果一台旧的笔记本电脑不断地运行它的风扇，它可能充满了灰尘，你可以很容易地清除它以改善噪音、电池寿命，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