Exercise creates its own virtuous circle. Once you start a programme and do it regularly, you'll feel so good you'll want to continue.锻炼身体能够形成一种良性循环。一旦你开始一项锻炼计划并持之以恒,你会感觉良好并坚持下去。You'll never learn to play the piano if you're not going to stick at it.如果你不打算持之以恒的话,你永远也学不会弹钢琴。Graham is so solidly consistent.格雷厄姆能持之以恒,始终如一。You'll never learn to play the piano if you're not prepared to stick to it.如果你不打算持之以恒的话,你永远也学不会弹钢琴。