/kɜːrv/
N-COUNT A ~ is a smooth, gradually bending line, for example, part of the edge of a circle; The ~ of her lips; 曲线； XXX has a steep learning ~; 学习曲线；
/kɜːrv/
N-COUNT A ~ is a smooth, gradually bending line, for example, part of the edge of a circle; The ~ of her lips; 曲线； XXX has a steep learning ~; 学习曲线；