adj.永无过失的，万无一失的，绝对可靠的，一贯正确的
n.可靠的事物

The oracle's prediction was infallible; it always came true without fail.
这位神谕的预言总是准确无误，从未出错。
An infallible judge is one who makes decisions without bias or error.
一位公正无私、不会犯错的法官。
The scientist's experiments were infallible, as they consistently produced the same results.
科学家的实验是万无一失的，总是能得到一致的结果。
She possesses an infallible sense of direction, never getting lost even in unfamiliar places.
她有着精确无误的方向感，即使在陌生的地方也不会迷路。
The compass is an infallible tool for navigation, guiding sailors to their destinations.
指南针是导航中不可或缺的工具，能确保船只准确到达目的地。
His memory was infallible, and he could recall events from decades ago with ease.
他的记忆力超群，能轻易回忆起几十年前的事情。
The law of gravity is an infallible scientific principle that governs our universe.
地心引力定律是宇宙中亘古不变的科学原理。
Her recipe for perfect pie is an infallible culinary treasure handed down through generations.
她的完美派食谱是一代代传下来，无懈可击的烹饪秘方。
The computer's algorithm was designed to be infallible, minimizing the risk of errors in calculations.
计算机的算法被设计得万无一失，以减少计算错误的可能性。
In mathematics, Euclid's fifth postulate, also known as the parallel postulate, was once considered infallible, but later challenged by non-Euclidean geometries.
在数学中，欧几里得第五公理（平行线公设）曾被认为是不容置疑的，但后来非欧几何提出了挑战。