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| # | 英语 | 汉语 | |
|---|---|---|---|
| 1 | symmetry | n. 对称：when one half mirrors the other | |
| 2 | line of symmetry | n. 对称轴：a line that divides a shape into two mirror halves | |
| 3 | rotation | n. 旋转：turning a shape around a point | |
| 4 | translation | n. 平移：sliding a shape without turning it | |
| 5 | reflection | n. 反射：flipping a shape over a line | |
| 6 | direction | n. 方向：the way something moves or faces | |
| 7 | clockwise | adv. 顺时针：moving in the same direction as clock hands | |
| 8 | counterclockwise | adv. 逆时针：moving in the opposite direction to clock hands | |
| 9 | horizontal line | n. 水平线：a line going from left to right | |
| 10 | vertical line | n. 垂直线：a line going up and down | |
| 11 | midpoint | n. 中点：the exact middle point of a line | |
| 12 | line segment | n. 线段：a part of a line with two endpoints | |
| 13 | center | n. 中心：the middle point of a shape | |
| 14 | statement | n. 陈述：a sentence that is true or false | |
| 15 | perpendicular | adj. 垂直的：meeting at a right angle | |
| 16 | isosceles triangle | n. 等腰三角形：a triangle with two equal sides | |
| 17 | circumference | n. 圆周：the distance around a circle | |
| 18 | bisect | v. 平分：to divide into two equal parts | |
| 19 | intersect | v. 相交：to cross at a point | |
| 20 | suppose | v. 假设：to think something is true |