趋向：trend, tend
下斜坡：declivity
下斜坡的：declivous
倾斜：incline, lean, bend, bias, dip, slant
倾倒：topple and fall, topple over
倾塌：collapse
倾覆：overturn, topple, tumble, capsize
端正：straight, upright
平坦：even, smooth, level, flat
平稳：steady, smooth and steady, stable
平衡：balance, equilibrium
