adj.同义反复的，赘述的

All bachelors are unmarried men.
所有的单身汉都是未婚男子。
A square is always a rectangle with four right angles.
正方形总是拥有四个直角的长方形。
If it's raining, then the ground is wet; it's raining, so the ground is wet.
如果在下雨，那么地面是湿的；现在在下雨，所以地面是湿的。
A triangle has three sides and three angles.
三角形有三条边和三个角。
The statement 'All dogs are animals' is tautological because it's self-evident.
所有狗都是动物这个陈述是自明的，因此是同义反复的。
The proposition 'All unicorns have one horn' is tautological if we accept the definition of a unicorn.
如果我们接受独角兽的定义，那么"所有的独角兽都有一只角"这个命题是同义反复的。
If a number is even, it can be divided by 2 without a remainder; 12 is even, so it can be divided by 2 without a remainder.
如果一个数是偶数，那么它可以被2整除而没有余数；12是偶数，所以它可以被2整除而没有余数。
A circle is a two-dimensional figure with all points on its boundary equidistant from its center.
圆是一个二维图形，其边界上所有点到中心的距离相等。
A statement like 'All humans are mammals' is tautological because it follows directly from the definition of 'human'." (像"所有人类都是哺乳动物"这样的陈述是同义反复的，因为它直接遵循"人类"的定义。
If something is red, it is colored red; the apple is red, so it is colored red.
如果某物是红色的，那么它的颜色就是红色；这个苹果是红色的，所以它的颜色是红色。