A curved structure spanning an opening and bearing weight.

• An arch-shaped entrance or passage; an archway.
• A natural opening in rock shaped like an arch.

跨越开口并承重的弧形结构。

• 拱形的入口或通道；拱门。
• 自然形成的拱形岩洞或石拱。

A curved shape like an inverted U; a segment of a curve.

• The curved part of the sole of the foot; the arch.

像倒置的U的弧形；曲线的一段。

• 脚底的弓形部位；足弓。

To bend or shape into an arch.

• To cover with one or more arches.

使弯成拱形；呈拱起状。

• 用拱或拱形结构覆盖。

Mischievously playful or sly; knowingly ironic.

• Chief or principal in rank or importance.

俏皮而狡黠的；带有会心机智的。

• 主要的；首要的。

Initialism for autoregressive conditional heteroskedasticity in econometrics.

计量经济学中的自回归条件异方差的缩写。