infallible

Even the most advanced computer software is not infallible and can still crash unexpectedly.

(Chinese) 即使是最先进的计算机软件也不是绝对可靠的，仍可能意外崩溃。

DNA testing is often considered an almost infallible method for identifying suspects in a crime.

(Chinese) DNA检测通常被认为是识别犯罪嫌疑人的一种近乎万无一失的方法。