Ao Bai is a balanced and textured coffee. The latte contains a lot of milk, and the ratio is about 4 1 8 1. In Aubrey, the ratio of milk to coffee is about 3 1 4 1. Ristretto is an espresso commonly used in Australia and White, and the extraction time is only 15 to 20 seconds, so the obtained coffee liquid is more mellow and rich.