需要注意噪音（越小越好）和转速（一般越大越好），但这两个存在矛盾，我们选择转速尽量大的情况下，噪音尽量小，这两个不可兼得。Formal KAWS thinks in giving back again to your community. We actively take part in and assist charitable initiatives focused on cannabis study, health-related develop