有人甚至说两种货币会达到等值。
另一种方法是，函数值不变的方向是,是与等值面相切的方向。
The other way to think about it, the direction in which the value doesn't change is a direction that's tangent to the level surface.
等值多用于数学、化学、逻辑等精密科学领域，意为一种绝对的对称和平等关系。
Equivalence is mostly used in several scientific fields such as mathematics, chemistry, and logic, indicating absolute equality in relationship.
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