立方

• ピンイン: lì fāng
• 漢字の分解: 立 = 立 (to stand/upright); 方 = 方 (square/direction)

意味

立方（3乗）／立方体

Used in mathematics (三的立方 = 3³ = 27), physics, and geometry. Can refer to the operation itself (cubing a number) or the resulting solid shape. Also used as a prefix for cubic units of measurement such as 立方米 and 立方厘米.

例文

1. 在数学课上，老师要求学生计算各正整数的立方值。
2. 这个水箱的容量是八立方，足以满足整栋楼一天的用水需求。
3. 几何题要求学生推导出各种规则立方体的表面积公式。

使い方ガイド

場面: mathematics, geometry, engineering, measurement

トーン: neutral

正しい言い方

• 请计算边长为五厘米的正方体的体积，即五的立方。(Please calculate the volume of a cube with a side length of 5 centimetres, which is 5 cubed.)
• 这批木材共运来二十立方，已全部卸载至仓库待用。(Twenty cubic metres of timber were delivered in this batch and have all been unloaded to the warehouse.)

避ける言い方

• 将'立方'等同于'正方形' — 立方是三维概念（体积），而正方形是二维图形（面积），二者维度不同，不可混用

起源と歴史

立 (upright/standing in three dimensions) + 方 (square) — a square standing upright, implying three-dimensional extension

文化的背景

世代: All ages

社会的背景: Universal