n. height above ground
n. indicator that establishes the horizontal when a bubble is centered in a tube of liquid
n. an abstract place usually conceived as having depth
v. aim at
n. 水平, 水准, 平地
a. 同高的, 平坦的, 齐平的, 水平的
vt. 弄平, 夷平, 使同等, 瞄准, 对准
vi. 变平, 拉平
[计] 级别