In other words, "it's easy to get rid of water, hard to get rid of fat." After a session on a machine, you might very well be half a kilo lighter, but the weight goes right back on when you drink water the next day.
換句話說，「脫水容易脫脂難」，一堂儀器瘦身課程下來，輕是可能輕了○．五公斤，但第二天喝多點水，體重又回來了。