什么是"单点失效"

就是这一点被攻破了，就全被攻破了

single-point failure
failure (1.39) that results from a single-point fault (1.122) and that leads directly to the violation of a safety
goal (1.108)
NOTE 1 A single-point failure is equivalent to a residual failure for an element (1.32) with 0 % diagnostic coverage
(1.25).
NOTE 2 If at least one safety mechanism (1.111) is defined for an HW element (e.g. a watchdog for a microcontroller),
then no faults (1.42) of the considered hardware element are single-point faults.

文件夹选项里有没有被改掉啊？