云端是什么?我常常听人讲,但就是不懂,云端到底在哪里?安全吗?
yúnduān shì shénme ?wǒ chángcháng tīng rén jiǎng ,dàn jiùshì bù dǒng ,yúnduān dàodǐ zài nǎli ?ānquán ma ?
What do you mean by the cloud? I always hear people talk about it, but I don't understand, where is the actual cloud? Is it safe?